Every IRS Form That Affects Your Retirement Account

Form 1099-R: Distributions

Filed by your custodian. Due to you and the IRS by January 31 of the year following the distribution.

This form reports every dollar that left your retirement account during the year. Box 1 shows the gross distribution amount. Box 2a shows the taxable amount (if the custodian knows it). Box 4 shows any federal tax withheld.

Box 7 contains the distribution code, which is the single most important piece of information on the form. The distribution code tells the IRS whether the money was a normal withdrawal, an early distribution, a direct rollover, a Roth distribution, or something else entirely.

A wrong code in Box 7 can trigger an automated CP2000 notice proposing tax you do not owe. If you receive a 1099-R with an incorrect code, contact the issuing custodian and request a corrected form before you file your return.

Form 5498: Contributions & Value

Filed by your custodian. Due to the IRS by May 31 of the year following the tax year.

This is the evidence form. It reports what went into your IRA and what the account was worth at year-end. Box 1 shows your total IRA contributions. Box 2 shows rollover contributions. Box 5 shows the fair market value as of December 31, which is the number used to calculate the following year's RMD and the denominator in the pro-rata calculation. Box 11 is a checkbox indicating whether an RMD is required for the following year. Box 13 covers late rollovers and recharacterizations.

Most people throw this form away because it arrives in May or June, long after tax season feels over. That is a mistake. The IRS uses Form 5498 to verify the rollovers and contributions you reported on your return. If the numbers on your return do not match the numbers on your 5498, the IRS sends a letter.

Your return is your version of events. Form 5498 is your custodian's version.

Form 8606: Basis Tracking

Filed by you with your tax return. Due when your return is due, including extensions.

This is the form that tracks your non-deductible IRA contributions over time. Part I calculates your cumulative basis and determines what percentage of a distribution or conversion is tax-free. Part II reports the taxable amount of a Roth conversion. Part III handles distributions from Roth IRAs when the ordering rules need to be applied.

The critical line is Line 14, which carries your remaining basis forward to the following year.

If you made non-deductible contributions and never filed Form 8606, the IRS has no record that any of your IRA money is after-tax. When you take distributions, they tax the full amount. The penalty for not filing Form 8606 is $50. The cost of not filing it is double taxation that can span decades of contributions.

Form 5329: Penalties

Filed by you, either with your tax return or as a standalone form for a prior year.

This is where retirement account penalties are calculated and reported. Part I covers the 10% early withdrawal penalty and any exceptions you are claiming. Part IX covers the excise tax on missed or insufficient RMDs (25%, or 10% if corrected within the SECURE 2.0 correction window). Parts III and IV cover the 6% penalty on excess contributions, Part III for Traditional IRAs and Part IV for Roth IRAs.

If you are requesting a waiver on a missed RMD, you file Form 5329, enter the shortfall amount, write "RC" (reasonable cause) on the relevant line, and attach a letter explaining what happened and confirming the corrective distribution has been taken.

Form 5329 can be filed for any prior year. There is no statute of limitations on the RMD excise tax. Filing voluntarily with a waiver request is always better than waiting for the IRS to discover the error on their own.

Form 5500-EZ: Solo 401(k) Reporting

Filed by you. Due by the last day of the 7th month after the plan year ends (July 31 for calendar-year plans). An extension to October 15 is available by filing Form 5558.

This form is required when your Solo 401(k) plan assets exceed $250,000 at the end of the plan year. It reports the plan's financial condition, including total assets, contributions, and distributions. Failure to file carries a penalty of $250 per day, up to $150,000.

Many Solo 401(k) owners do not realize this filing requirement exists until the plan grows past the threshold. If your plan balance is under $250,000, no filing is required. Once you cross $250,000, the filing requirement applies every year going forward until the plan is terminated.

Form W-4R: Withholding Elections

Filed by you with your custodian or plan administrator before taking a distribution.

This form replaced the retirement-specific sections of the old W-4P starting in 2023. It allows you to choose the federal income tax withholding rate on your IRA or retirement plan distributions. The default withholding rate on non-periodic distributions (like a one-time IRA withdrawal) is 10%. You can elect a different rate, including 0%, depending on your situation.

For indirect rollovers from employer plans, the mandatory 20% withholding applies regardless of what you elect on the W-4R. The W-4R only controls elective withholding on IRA distributions and non-mandatory plan distributions.

Getting this form wrong means either owing a large balance at tax time or over-withholding and giving the IRS an interest-free loan for the year.

Form SSA-44: IRMAA Appeals

Filed by you with the Social Security Administration.

This form requests a reduction in your Medicare IRMAA surcharge based on a life-changing event that reduced your income. Qualifying events include retirement, death of a spouse, divorce, loss of income from work stoppage, loss of pension, and employer settlement or bankruptcy.

A large Roth conversion that pushed you above an IRMAA threshold is not a qualifying life-changing event. Neither is a one-time capital gain or an investment windfall. The appeal only works when your current income is lower than the income from the lookback year.

You submit Form SSA-44 with documentation of the life-changing event and your estimated current-year income. If approved, the SSA recalculates your premium using the current year instead of the two-year lookback.

Form 1040: The Lines That Matter

Your tax return is where all the other forms converge.

Lines 4a and 4b report IRA distributions (total distribution and taxable amount). Lines 5a and 5b report pension and annuity distributions. Line 7 reports Social Security benefits, which interact with retirement income through the provisional income formula that determines how much of your Social Security is taxable.

Schedule 2, Line 8 is where the additional tax from Form 5329 (early withdrawal penalty or missed RMD penalty) flows to the return.

The amounts on these lines come directly from your 1099-R, your 8606, and your 5329. If any of those source forms are incorrect, the return is incorrect.

The return is what the IRS compares against the third-party forms it receives. When the numbers match, nothing happens. When they do not match, you get a letter.

How the Forms Connect

The IRS does not look at any of these forms in isolation.

The 1099-R tells the IRS money left an account. The 5498 tells the IRS money arrived at another account. Your tax return tells the IRS whether the transaction was taxable. Form 8606 tells the IRS how much of the transaction involved money that was already taxed. Form 5329 tells the IRS whether a penalty applies.

The IRS matching program compares all of these against each other on a delayed timeline. The 1099-R arrives in January. Your return arrives between January and April. The 5498 arrives in May. The matching process runs in the summer and fall.

A mismatch between any two forms can generate a notice 12 to 18 months after the transaction occurred. Keeping copies of every form, filing every required form on time, and reconciling the numbers before you file your return is the simplest way to ensure you never receive a letter that starts with "We have proposed changes to your return."

Frequently Asked Questions