How do you fix retired pay withholding with a second job?

Why do two correct withholdings leave you short?

Two correct withholdings leave you short because each payer treats its pay as your only income. DFAS and your employer each subtract a full standard deduction ($16,100 single, $32,200 married filing jointly) and start at the lowest bracket, while your return allows one deduction and stacks both incomes into the higher brackets.

Say the salary is $165,000 and the retired pay is $60,000. Each payer sees only its own slice, so neither one knows the other exists.

A penalty generally applies if you owe $1,000 or more after withholding, unless you paid at least 90% of this year's tax or 100% of last year's. The IRS raises the bar to 110% of last year's tax when last year's AGI was above $150,000. Most second-career retirees cross that line the moment the salary shows up.

Estimated tax installments fall due April 15, June 15, September 15 and January 15. One more fact helps: military retired pay is taxable, while VA disability pay isn't and needs no withholding at all.

Step 1: Gather 4 numbers from 4 papers

Pull 4 numbers from 4 papers before you touch any form. Everything later in this article builds on them.

The retiree account statement in myPay gives taxable retired pay and federal tax withheld so far. For Maureen, the hypothetical reader in Step 4, that's $5,000 each month, or $60,000 a year. The pay stub gives year-to-date federal withholding. Last year's Form 1040 gives total tax and AGI, which decide whether the 100% or the 110% safe harbor applies.

The VA award letter only confirms what to leave out. Maureen's 60% rating pays tax-free money that never belongs in a withholding estimate.

The slip at this step is running the IRS Tax Withholding Estimator from memory. It only works when you type in the year-to-date withheld amounts from both payers, and memory tends to round in your favor.

• Retiree account statement in myPay
• Latest pay stub from the employer
• Last year's Form 1040
• VA award letter, to leave out

Step 2: When does your income tip into a penalty?

You face an underpayment penalty when you owe $1,000 or more after withholding and paid less than 90% of this year's tax or 100% of last year's tax. If last year's AGI was above $150,000, the bar is 110% of last year's tax instead of 100%.

Place yourself like this. Owing under $1,000 in April carries no penalty. Owing more is covered only by those 3 tests, and Maureen's prior-year AGI above $150,000 puts her on the 110% test.

A first full year with both incomes is often safe, because last year's tax was lower. A second year usually isn't, since the bar becomes 110% of the higher tax.

One recent change catches people who built their plan years ago. Catch-up contributions must now be Roth for anyone whose prior-year FICA wages exceeded $150,000. At 52 and earning $165,000, Maureen's $8,000 catch-up no longer lowers her taxable wages, so a withholding plan built when it was pre-tax is short on that $8,000 too.

Step 3: Compare W-4, myPay and quarterly estimates

You have 3 ways to close a gap, and they differ on 3 things: when the money counts as paid, what happens if the job ends, and how you change it. Which one holds up when the salary stops or a payment slips?

Savant Wealth Management's plain rule: put the main fix on the income that lasts longest, which is the retired pay. Use the W-4 for pieces tied to the salary, such as a bonus. Quarterly estimates keep your cash longer, but they punish a late or small installment, so they suit people whose income swings a lot.

Step 4: Size the extra withholding in dollars

Maureen is a hypothetical person: 52, single, a retired Air Force lieutenant colonel working as a civilian program manager at $165,000. She also receives $60,000 a year in taxable retired pay, has a 60% VA rating and holds a $610,000 traditional TSP. She wants to know how much to convert to Roth each year, but her withholding needs fixing first.

Her employer and DFAS each withhold as if their income were her only income. For illustration, the IRS Tax Withholding Estimator shows her about $10,000 short. In her second full year with both incomes, last year's high tax means the safe harbor no longer covers her.

Her plan looks smart: keep the $10,000 invested and send it with the January 15 estimate. (All investing carries risk, and you can lose money, including what you put in, which is a poor fit for cash you already owe.) The plan costs money because estimates count only when paid. The April 15, June 15 and September 15 installments are each short, and the penalty runs on each short quarter until it's paid. Check the current IRS underpayment rate rather than assuming one.

The fix, made in August: $2,500 extra each month in myPay, September through December. The arithmetic is 4 × $2,500 = $10,000. Withholding is treated as paid evenly across all 4 quarters, so those 4 months cover the earlier quarters too.

Savant Wealth Management puts this on the decision list with its own due date, the December retired pay, and settles it before any Roth conversion question. A conversion adds income to the same gap, so Maureen's conversion amount waits until the withholding is set.

Quick test: if both payers together will withhold $1,000 or more below your expected tax, divide the gap by the retired pay months left in the year and add that amount in myPay. A change that lands by the December retired pay covers the earlier quarters too.

When does each piece fall due? Compare year 1 with year 2 in the table: year 1 is safe, year 2 is not.

Step 5: Ask payroll and DFAS 3 things

Three short questions settle most of the guesswork, and 2 of them go to payroll.

Ask payroll whether it accepts a flat Step 4(c) amount and keeps it after a raise. An answer that should worry you is 'we still use your old allowances'. That means the system is reading a form that no longer exists.

Ask how bonuses are withheld. If the answer is a flat supplemental rate and your marginal rate is higher, add the difference to the fix.

Then ask DFAS, or check myPay, which month's pay the change will hit. If the answer is the January pay, the change misses the year. Make it by November so it lands on the December retired pay.

• Payroll: flat Step 4(c) amount after raises
• Payroll: how bonuses are withheld
• DFAS: which month's pay changes

Step 6: Replace an old allowance election

The W-4 and the pension withholding form (W-4P) both dropped allowances. A retired pay election set years ago may still be running on the old basis, so file a fresh election in myPay the month a salary starts. Nothing in the system will tell you the old one went stale. You'll find out in January, when the 1099-R shows what it actually withheld.

What happens if the safe harbor runs out?

If the safe harbor runs out, you owe the April balance plus an underpayment penalty for each quarter your payments fell short. The safe harbor protects you only when withholding reaches 90% of this year's tax, 100% of last year's, or 110% if last year's AGI topped $150,000.

Leaning on last year's lower tax costs nothing in the first year with both incomes. Maureen owes $10,000 in April with no penalty, because her $33,300 withheld tops 110% of last year's $30,000 tax ($33,000). In year 2 the bar jumps to 110% of $43,300 ($47,630) or 90% of the new year's tax, and the unchanged withholding leaves about $10,000 due plus a penalty.

Entering tax-free VA pay in the estimator is another quiet leak. At an illustrative $1,500 each month, that's $18,000 a year, and at 24% about $4,320 gets withheld for nothing. The IRS holds that money until the refund the next spring.

Treating the April balance as the only cost is the third error. A balance of $1,000 or more that misses every safe-harbor test also carries a penalty for each short quarter.

This covers federal withholding only. State withholding, a working spouse, large bonuses or a Roth conversion change the gap. Someone whose income swings a lot during the year may do better with quarterly estimates than with a fixed myPay amount.

Bring both pay statements to Savant Wealth Management

Savant Wealth Management can read your myPay statement, your latest pay stub and last year's return together, then show the monthly myPay amount that closes the gap before December. Reach out through the request form, and the fee schedule arrives in writing before the intro call. This is general education, not advice on your return.