RMD Withholding Election Calculator 2026 β Form W-4R
Calculate optimal federal and state withholding on Required Minimum Distributions. Compare default 10% vs actual marginal rate, analyze refund/owe gap, and plan multi-account withholding to meet safe harbor.
$
%
Default is 10%. Enter 0 to opt out. Form W-4R required. %
Your expected marginal rate on RMD income %
$0
Federal Withheld
$0
State Withheld
$0
Estimated Tax Owed at Filing
$0
Refund (+) / Owe at Filing (β)
Withholding vs. Tax Liability Analysis
RMD Withholding Options
Under IRC Β§3405, 10% is the default federal withholding on non-periodic retirement distributions including RMDs. You can change this election on Form W-4R at any time.
State Withholding Requirements
| State | Required Withholding | Opt-Out? |
|---|---|---|
| California | 10% (3.3% alternative for annuities) | Yes β Form 590 |
| Michigan | 4.25% | Yes β written election |
| Oregon | 8% | Yes β written election |
| Vermont | 27% of federal withholding | Yes β written election |
| Most other states | No mandatory withholding | Optional β varies |
Sources and References (click to expand)
- IRC Β§3405 β Special Rules for Pensions, Annuities, and Certain Other Deferred Income
- IRS Form W-4R β Withholding Certificate for Nonperiodic Payments
- IRS Publication 590-B β Distributions from Individual Retirement Arrangements
- Treasury Reg Β§35.3405-1 β Questions and Answers on Withholding from Pensions
- IRS Notice 2022-6 β Guidance on Β§72(t) SEPP and RMD Withholding Updates
Extended
Multi-Account RMD Withholding Optimizer + Safe Harbor Analysis
Input multiple IRA/401k accounts, optimize total withholding to break even, view withheld vs needed bar chart, and quarterly safe harbor analysis
Add multiple IRA/401k accounts. Optimize withholding across accounts to break even or hit safe harbor.
%
%
$
%
| Account | RMD | WH % | Fed Withheld | State Withheld | Net Distribution | Tax Owed | Gap |
|---|
No accounts added. Add IRA/401k accounts above.
Bar chart comparing total withheld vs total tax needed across all RMD accounts.
Calculate how much to withhold from your December RMD to satisfy the safe harbor and avoid underpayment penalties.
$
From last year's Form 1040 Line 24 $
$
Determines if 100% or 110% safe harbor applies $
$
Frequently Asked Questions
What is the default withholding rate on RMDs and how do I change it?
The default federal withholding on IRA and retirement plan distributions, including RMDs, is 10% under IRC Β§3405. You can elect to have no withholding or any other percentage by completing Form W-4R (Withholding Certificate for Nonperiodic Payments and Eligible Rollover Distributions). You can submit a new Form W-4R to your IRA custodian at any time to change your withholding election. Some custodians allow you to elect a specific dollar amount or percentage through their online portal. If you have multiple IRAs or 401(k)s, you need to make a withholding election for each account separately.
Why is 10% default withholding often not enough for RMDs?
The 10% default is based on the assumption that the distribution is your only income. For most retirees with Social Security (up to 85% taxable), pensions, investment income, and RMDs combined, the marginal tax rate is often 22%, 24%, or higher. Example: A retiree with $40,000 Social Security (85% taxable = $34,000), $20,000 pension, and $50,000 RMD has $104,000 of taxable income β landing in the 22% bracket. Withholding 10% on the $50,000 RMD = $5,000; actual tax on RMD portion β $11,000. This creates a $6,000 shortfall, potentially triggering underpayment penalties.
Can I use RMD withholding to avoid making quarterly estimated tax payments?
Yes β this is one of the most tax-efficient strategies for retirees. Unlike estimated tax payments (due quarterly), withholding is deemed paid ratably throughout the year regardless of when it actually occurs. This means you can take a single large RMD in December with 100% withholding and it counts as if taxes were paid evenly each quarter, avoiding underpayment penalties. This is sometimes called the "December withholding strategy." It is especially useful for retirees who receive irregular income like large capital gains distributions in late November/December.
What states require mandatory withholding on retirement distributions?
Several states require mandatory state income tax withholding on retirement distributions unless the payee opts out. California requires 10% withholding on non-periodic distributions unless Form 590 (exemption) is on file. Michigan requires 4.25% withholding. Oregon requires 8% withholding on distributions. Vermont requires 27% of the federal withholding amount. Iowa, Maine, and several other states also have required withholding rules. Contact your IRA custodian for the withholding rules in your state β forms and opt-out procedures vary by state.
What is the safe harbor for avoiding underpayment penalties on RMD income?
The IRS safe harbor under IRC Β§6654 for avoiding the underpayment penalty requires paying the lesser of: (1) 100% of the prior year's total tax liability (110% if AGI exceeded $150,000 in the prior year), or (2) 90% of the current year's tax liability. Through withholding strategy, retirees can satisfy safe harbor by withholding enough from RMDs to cover 100% of prior year tax (110% rule if high income). Example: prior year tax = $20,000. Withhold $20,000 from December RMD β entire underpayment penalty is avoided regardless of when income came in. Consult a CPA for your specific situation.