How Does an IRA Work?

An IRA — Individual Retirement Account — is one of the most flexible and widely used retirement planning tools available to American workers because it combines meaningful tax advantages with personal control over how money is invested, managed, and eventually converted into retirement income. Unlike an employer-sponsored plan where investment menus are pre-set and account management is handled through a benefits department, an IRA belongs to you personally. It is held at a custodian of your choosing — a bank, brokerage firm, or insurance company — and invested according to your objectives rather than your employer’s plan design. For many people, the IRA becomes the single largest retirement account they own, not necessarily from annual contributions, but because it becomes the natural destination for direct rollovers from multiple employer plans accumulated across a career.

Understanding how an IRA works is not just a technical exercise. It is the foundation for making informed decisions about three of the most consequential financial questions most households eventually face: How should I manage and invest accumulated retirement savings? How do I convert those savings into reliable income that lasts through retirement? And how do I do both in a way that keeps taxes from consuming more of my retirement money than necessary? At Diversified Insurance Brokers, we work with clients nationwide who use IRAs for long-term tax-advantaged growth, for consolidating old employer accounts into a single manageable strategy, and for building retirement income that cannot be outlived through tools like annuities positioned inside the IRA structure. This guide walks through how an IRA works from start to finish — contributions, investment choices, rollovers, taxes, required distributions, and the income planning decisions that matter most as retirement approaches.

What an IRA Actually Is — and Why the Container Metaphor Matters

One of the most useful ways to understand an IRA is to stop thinking of it as an investment and start thinking of it as a container for tax advantages. The IRA itself is the account structure — the legal and tax wrapper that provides the deferral, the deductibility, or the tax-free growth depending on the type. The investments inside the IRA are entirely separate from the IRA structure itself. You choose those based on your goals, your timeline, and how the IRA fits into your broader retirement plan.

This distinction matters because it clarifies a question that confuses many people: “Should I put my money in an IRA or should I invest it?” The answer is that these are not opposing choices. The IRA is where you decide to receive tax advantages on your money. How you invest that money — in stocks, bonds, mutual funds, ETFs, certificates of deposit, or insurance-based products like fixed annuities — is a separate decision made inside the IRA container.

The IRA is owned by you personally, not by your employer. This means it follows you through every job change, career transition, and life event. When employers change, when plans terminate, when business structures shift, your IRA remains yours. That portability is one of the most underappreciated features of the IRA structure — and it is the reason that IRAs often become the consolidation point for multiple old employer retirement accounts over time.

The other thing an IRA is not is a “small account.” Many people associate IRAs with the annual contribution limit — the relatively modest dollar amount the IRS allows each year from earned income. But the vast majority of large IRAs are not built through annual contributions alone. They grow to their size through rollovers — transfers from 401(k)s, 403(b)s, 457 plans, TSPs, SIMPLE IRAs, SEP IRAs, and other qualified retirement accounts accumulated across a working life. A person who changes employers three times, contributes consistently to employer plans throughout their career, and consolidates those accounts into an IRA at retirement can easily hold a seven-figure IRA balance without ever having contributed more than a few thousand dollars annually through the IRA contribution channel. Understanding guaranteed income from annuities becomes especially relevant once an IRA reaches the size where generating reliable retirement income becomes the primary planning concern.

Traditional vs. Roth IRA: Opposite Tax Directions, Different Strategic Roles

The two most common IRA types — Traditional and Roth — differ primarily in when the tax benefit is received. Everything else about how the account functions — the ability to invest, the flexibility to choose investments, the personal ownership — is essentially the same. The tax timing difference is what creates the strategic distinction between them, and that distinction has real consequences for retirement income planning.

A Traditional IRA offers a potential current-year tax deduction on contributions (subject to income and workplace plan coverage rules), and all growth inside the account accumulates tax-deferred. No taxes are owed on gains, dividends, or interest as they accumulate — only when money is eventually withdrawn. At that point, withdrawals are taxed as ordinary income in the year received. This means a Traditional IRA is essentially a deferral arrangement: you reduce taxes now and pay them later, when the money is distributed. For someone in a high tax bracket during working years who expects to be in a lower bracket in retirement, this trade-off can produce meaningful tax savings over time.

A Roth IRA works in the opposite direction. Contributions are made with after-tax dollars — no current deduction. But the growth inside the account accumulates tax-free, and qualified withdrawals in retirement are also tax-free. Roth IRAs also do not have Required Minimum Distributions (RMDs) during the original owner’s lifetime, which creates a significant planning advantage: the account can continue growing without being forced to distribute, making it a powerful tool for both long-term accumulation and legacy planning. For someone who expects to be in a similar or higher tax bracket in retirement, who wants flexibility around income control, or who is building accounts for heirs who will benefit from tax-free inherited distributions, the Roth structure offers advantages that compound over time.

A common multi-decade strategy is to use both types in coordination — building Traditional IRA assets during peak earning years when deductions provide the most value, and building Roth assets during lower-income years or through systematic Roth conversions when the tax cost of the conversion is manageable. This creates tax diversification: in retirement, multiple buckets with different tax treatments allow income to be drawn from the most tax-efficient source in any given year, which can reduce lifetime tax liability significantly compared to holding all assets in a single tax-treatment bucket. Our resource on Roth conversion strategies explores how the conversion decision is evaluated in the context of broader retirement income planning.

IRA Contribution Rules: How Annual Contributions Work

Annual IRA contributions are the most familiar IRA funding mechanism, though for most retirees with large IRAs, they are not where the account’s size originated. Contributions require earned income — you must have wages, salary, self-employment income, or other IRS-qualifying earned income to contribute to an IRA in any given year. The IRS sets annual contribution limits that typically adjust upward over time for inflation, and those limits apply per person — not per account type. The combined total contributed to Traditional and Roth IRAs in any year cannot exceed the annual limit.

Eligibility to deduct Traditional IRA contributions, and eligibility to contribute directly to a Roth IRA, are both subject to income thresholds that phase out at higher income levels. Whether someone has a workplace retirement plan also affects Traditional IRA deductibility. At high enough income levels, neither the deduction nor direct Roth contributions are available — though strategies like backdoor Roth conversions can still allow Roth savings for high earners through an indirect route.

Spousal IRA contributions are an often-overlooked provision that allows a working spouse to fund an IRA for a non-working or lower-income spouse, as long as the couple’s combined earned income is sufficient and they file taxes jointly. This provision effectively doubles a household’s annual IRA contribution capacity when one spouse is not working — a meaningful advantage for households with one primary earner and a stay-at-home spouse.

Annual contribution deadlines typically run through the federal tax filing deadline of the contribution year — commonly April 15 of the following year — which allows contributions to be made retroactively once income is finalized and the tax picture for the year is clearer. This flexibility is worth using, particularly for self-employed individuals whose income may not be certain until the year closes.

IRA Investment Options: What the Container Can Hold

Because the IRA is a container rather than an investment, the range of permissible investments inside an IRA is determined by the custodian rather than by the IRA rules themselves. Different custodians offer different investment menus, which is why the IRA at a brokerage can hold a different range of investments than an IRA at a bank or an IRA at an insurance company.

Standard brokerage-held IRAs can typically hold individual stocks, bonds, ETFs, mutual funds, options, REITs, money market funds, and CDs. Bank-held IRAs typically offer more conservative options — savings accounts, CDs, and money market instruments. Insurance company-held IRAs are structured around insurance products — fixed annuities, fixed indexed annuities, and variable annuities — with the IRA serving as the qualified account wrapper for the annuity contract.

The investment selection inside an IRA should be driven by the IRA’s intended role in the retirement plan, not by what’s available at any particular custodian. A 35-year-old using an IRA for long-term growth has a different optimal investment profile than a 67-year-old using an IRA as the primary source of retirement income. The former may want broad market exposure and long time horizon compounding. The latter may want principal protection, predictable income, and minimal exposure to sequence-of-returns risk — the danger that a market decline in early retirement permanently impairs the account’s ability to sustain withdrawals.

This is where annuities inside IRAs become relevant. When an IRA is positioned as an income vehicle rather than an accumulation vehicle, the criteria for “good investments” shift from return potential to income reliability, principal protection, and longevity management. Fixed annuities provide guaranteed interest crediting and principal protection. Fixed indexed annuities provide downside protection with index-linked growth potential. Income riders add the guarantee of lifetime income regardless of account value performance. Our resource on annuity free withdrawal rules explains how liquidity is maintained within annuity contracts for those who want income reliability while preserving access to a portion of account value.

IRA Rollovers: The Most Common Way Large IRAs Are Built

For most people approaching or in retirement, the IRA’s size reflects not annual contributions but rollovers — transfers from employer-sponsored retirement plans accumulated over a working career. A rollover is the movement of retirement funds from one qualified account type to another while preserving their tax-qualified status. When executed correctly, rollovers are non-taxable events. When executed incorrectly, they can become taxable distributions with penalties — which is why understanding the mechanics matters enormously for anyone moving significant retirement assets.

The two primary rollover types are the direct rollover and the indirect rollover, and the differences between them are not merely procedural.

A direct rollover — also called a trustee-to-trustee transfer — moves funds from the sending institution directly to the receiving institution. The account owner never takes possession of the money. The sending plan may issue a check made payable to the receiving custodian “for the benefit of” the account owner, or the transfer may happen electronically. Either way, the funds never pass through the account owner’s hands, which means no mandatory withholding occurs, no 60-day clock starts, and the risk of accidental taxable distribution is eliminated. This is why direct rollovers are the standard recommendation for moving employer plan assets. Our resource on what a direct rollover is covers the mechanics in detail.

An indirect rollover sends the distribution to the account owner personally, who then has 60 days to deposit it into a qualifying IRA. The problem is that the sending plan is required to withhold 20% of the distribution for taxes — and if the account owner only deposits the 80% they received, the 20% withheld is treated as a taxable distribution for that year. To complete the rollover without owing taxes on the withheld amount, the account owner must deposit 100% of the original distribution — including the 20% they didn’t actually receive — from other funds. Most people don’t anticipate this requirement, which is how indirect rollovers generate avoidable tax bills. Direct rollovers are almost always the better choice.

The rollover stage is also one of the most significant decision points in retirement planning because it creates an opportunity to reconsider what the money should do next. Employer plans have investment menus chosen by the employer’s benefits committee. An IRA offers broader flexibility — including the ability to use conservative, income-focused strategies like fixed annuities that many employer plans do not offer. For someone nearing retirement whose primary objective shifts from accumulation to income generation, the rollover into an IRA may be the moment when the investment strategy changes substantially. Our resources on how a 401(k) works and how a 403(b) works provide context for how those plans differ from IRAs and when the rollover conversation makes sense.

IRA Tax Treatment: What Gets Taxed, When, and Why It Matters for Retirement Income

The tax treatment of IRA distributions is one of the most practically consequential aspects of IRA planning for retirees — not because the rules are complicated, but because the order and amount of IRA withdrawals can significantly affect lifetime tax liability, Medicare premium costs, and Social Security benefit taxation in ways that many people do not anticipate until the bills arrive.

For Traditional IRAs funded with pre-tax dollars — which includes most rollover IRAs that originated from 401(k)s and 403(b)s — every dollar withdrawn is taxed as ordinary income in the year received. This means IRA distributions are not taxed at favorable capital gains rates; they are taxed at the same marginal rate as wages, salary, self-employment income, or any other ordinary income. For a retiree taking $60,000 per year in IRA distributions alongside $30,000 in Social Security benefits, the combined income determines the marginal bracket, the percentage of Social Security that becomes taxable, and potentially the Medicare premium tier through the Income-Related Monthly Adjustment Amount (IRMAA).

IRMAA is particularly important to understand. Medicare Part B and Part D premiums are means-tested — higher-income beneficiaries pay significantly more than the standard premium. The income threshold is based on Modified Adjusted Gross Income from two years prior, which means IRA distribution decisions made today affect Medicare costs two years from now. A large IRA distribution, a Roth conversion, or any other income event that pushes household income above IRMAA thresholds can increase Medicare premiums by hundreds of dollars per month. Our resource on what IRMAA is explains the threshold structure and how IRA distribution planning intersects with Medicare premium management.

Roth IRA distributions follow different rules. Contributions can always be withdrawn tax-free and penalty-free because they were already taxed. Earnings can be withdrawn tax-free if the Roth account is at least five years old and the account holder is at least 59½. For retirees with significant Roth assets, this tax-free income source provides flexibility to manage taxable income — drawing from Roth accounts in years when additional Traditional IRA or Social Security income would otherwise push the household into a higher bracket or above an IRMAA threshold.

The strategic insight here is that IRA tax planning is not just about minimizing taxes in any given year — it is about managing the total tax exposure across a 20 or 30 year retirement. Systematic Roth conversions in the years between retirement and RMD commencement, strategic coordination of income sources, and careful attention to bracket and threshold management can produce significantly better after-tax retirement outcomes than an unplanned “just withdraw what I need each year” approach.

Required Minimum Distributions: Why Deferred Taxes Eventually Come Due

Required Minimum Distributions are the IRS mechanism for ensuring that tax-deferred retirement money is eventually taxed. The government extended significant tax advantages for decades of accumulation, and RMDs are how those deferred taxes are ultimately collected. Once an account holder reaches the applicable RMD age — which has been adjusted multiple times through legislation including the SECURE Act and SECURE 2.0 Act — a minimum distribution must be taken each year based on IRS life expectancy tables and the prior year-end account balance.

The RMD amount increases over time both because the applicable divisor from the IRS life expectancy table decreases as the account holder ages and because account balances that continue to grow faster than the distribution percentage produce larger RMDs in later years. For retirees with large Traditional IRA balances who don’t need the income for living expenses, RMDs can become a significant forced-income event that increases taxable income, affects Social Security benefit taxation, and potentially triggers higher Medicare premiums regardless of whether the money is “needed.” Our resource on RMDs after SECURE 2.0 explains the current age requirements, calculation methods, and planning considerations under the updated rules.

Roth IRAs do not have RMDs during the original owner’s lifetime — which is one of the most significant structural advantages of Roth accounts for long-term tax management. A Roth IRA can grow and compound indefinitely without being forced to distribute, making it an ideal holding structure for assets intended for legacy planning or for late-retirement spending flexibility.

For annuities inside IRAs, RMD rules still apply. The RMD must be calculated based on the account balance and taken annually. In most cases, the annual rider income withdrawal from a fixed indexed annuity with a lifetime income rider can satisfy the RMD requirement — but this requires that the rider withdrawal amount be at least as large as the calculated RMD. When the RMD exceeds the rider’s defined annual income amount, additional distributions may be required, and the interaction of those distributions with the rider guarantee must be understood before the annuity is purchased. Planning for this interaction avoids situations where RMD compliance inadvertently reduces the lifetime income guarantee in unintended ways.

Converting IRA Assets Into Retirement Income

The transition from accumulation to distribution — from building a large IRA balance to generating income from it — is the most consequential strategic shift in retirement planning. It changes the criteria for evaluating investment decisions, the relevant risks that need to be managed, and the planning horizon over which those decisions must perform. Building a large balance is largely a function of contribution consistency, market returns, and time. Converting that balance into sustainable income requires managing sequence-of-returns risk, longevity risk, inflation risk, and tax risk simultaneously — often for 25 to 35 years.

A purely market-based systematic withdrawal approach — withdrawing a set percentage or dollar amount each year from an invested IRA — can work well when markets cooperate. It can fail significantly when markets decline during the early years of retirement, which is when sequence-of-returns risk is most damaging. A retiree who withdraws 4% to 5% per year from a portfolio that declines 25% in the first two years of retirement is making those withdrawals from a permanently reduced base, which accelerates depletion regardless of subsequent market recovery.

Annuities within an IRA can address this risk by converting a portion of the IRA balance into a guaranteed income stream that does not depend on market conditions. A fixed annuity inside an IRA provides principal protection and guaranteed interest — the balance does not decline in negative market years. A fixed indexed annuity provides a floor of zero credited interest in negative index years alongside upside participation in positive years. An income rider on a fixed indexed annuity adds the guarantee that a defined annual withdrawal amount continues for life regardless of account value performance. Our resource on whether annuities are worth it evaluates the cost-benefit framework for this decision in the context of a comprehensive retirement income plan.

The most common approach is not to convert the entire IRA to an annuity — it is to position a portion for guaranteed income and leave the remainder for growth, liquidity, and legacy planning. This “floor and upside” architecture creates a base of income that covers essential expenses regardless of market conditions, while preserving growth opportunity for discretionary spending and long-term portfolio resilience. The IRA’s flexibility is what makes this layered approach possible — different custodians and product types can serve different roles within the same overarching IRA strategy.

Transferring IRA Assets to an Annuity: The Clean Process

When someone decides to reposition a portion of IRA assets into an annuity — whether a fixed annuity for stable guaranteed interest, a fixed indexed annuity for principal protection with growth potential, or an annuity with a lifetime income rider — the correct transfer method is a trustee-to-trustee transfer. This moves the IRA assets directly from the current IRA custodian to the insurance company issuing the annuity, with the annuity titled as a qualified IRA annuity. The account owner does not take possession of the funds at any point during the transfer.

The practical process involves completing the annuity application with the insurance carrier, submitting the transfer request form to the current IRA custodian, and allowing the institutions to coordinate the transfer directly. Most carriers have dedicated transfer teams that manage this process and follow up with receiving custodians to ensure the funds move promptly and the paperwork is handled correctly. The timeline varies from a few days to a few weeks depending on the sending custodian’s processing speed and how promptly documentation is completed.

The critical requirement is that the transfer must be institution-to-institution — if funds are distributed to the account owner personally during an IRA-to-annuity transfer, that distribution is taxable in the year received. There is no 60-day rollover window available when the sending institution is an IRA and the receiving institution is an insurance company — the transfer must be direct for it to remain non-taxable. Our resource on how to transfer an IRA to an annuity covers the full process including documentation requirements, timeline expectations, and common issues to anticipate.

What Happens to an IRA When You Die

IRAs pass to named beneficiaries outside of probate, which means the beneficiary designation on the IRA account controls who receives the assets — not the will. This makes beneficiary designation maintenance one of the most important ongoing maintenance tasks for any IRA owner. Outdated designations, missing designations, or designations that conflict with estate planning goals can produce unexpected and unwanted outcomes regardless of what the will says.

When an IRA owner dies, the account transitions to an inherited IRA governed by rules that differ substantially from the rules for the original owner’s IRA. The rules for inherited IRAs have been significantly changed by recent legislation, and the appropriate distribution strategy depends heavily on the relationship between the beneficiary and the deceased, the age of each, and whether the IRA was a Traditional or Roth account. Our resource on how an inherited IRA works explains the current rules for spousal and non-spousal beneficiaries, the ten-year rule that applies to most non-spouse inherited IRAs, and the planning considerations that help beneficiaries manage distributions efficiently.

For annuities inside IRAs, death benefit provisions can add a layer of protection for beneficiaries beyond the standard inherited IRA rules. Many annuity contracts include built-in death benefits that guarantee beneficiaries receive at least the original premium or the account value, whichever is higher — a meaningful protection in scenarios where the account value has declined. Our resource on annuity beneficiary death benefits explains how death benefits are structured in annuity contracts and how they interact with IRA beneficiary planning.

Consolidating Multiple Old Accounts Into One IRA

Career mobility has created a generation of retirees who arrive at retirement with multiple old employer plans sitting dormant at different custodians — a 401(k) from a job held in the 1990s, a 403(b) from a nonprofit tenure, a small rollover IRA opened during a job transition, and perhaps a current employer plan approaching its rollover window. Managing multiple accounts across multiple custodians with multiple investment strategies is complex, creates paperwork burdens, makes beneficiary management cumbersome, and often results in no account receiving the strategic attention it deserves.

Consolidating these accounts into a single IRA simplifies the picture dramatically. One account, one custodian, one beneficiary designation to maintain, one investment strategy to evaluate and update. The consolidated balance also provides clearer visibility into total retirement resources and makes income planning more straightforward — when one account holds all the retirement assets, projecting income scenarios, evaluating annuity options, and coordinating with Social Security and other income sources is fundamentally simpler than coordinating across five separate accounts at different institutions.

However, consolidation is not automatically the right choice in every situation. Some employer plans have unique features worth retaining — certain creditor protections that may exceed what an IRA provides, access to institutional investment options not available through retail IRA menus, or net unrealized appreciation treatment for company stock that can be lost in a rollover. Evaluating these plan-specific features before initiating a consolidation rollover is part of a complete decision process.