Missed a quarterly tax payment — now what?
First, calibrate the fear: missing an estimated payment triggers no letter, no audit flag, no fixed fine. The “penalty” is interest on the shortfall, accruing daily from the missed deadline until you pay (or until the April filing deadline caps that quarter’s clock). The IRS sets the rate quarterly at a formula tied to short-term Treasury rates — real money on large amounts, coffee money on small ones, and always smaller tomorrow than next month. Which yields the whole strategy: pay what you can now. The estimator below spreads your remaining obligation across the deadlines still open.
Preset: enter income and what you’ve already paid — the schedule shows the catch-up
How it works
- Open this page — the estimator is already set up for "Missed a quarterly tax payment — now what?".
- Enter your expected 2026 income and business expenses. Estimates update as you type.
- Add a W-2 job, kids, or last year’s tax if they apply — the safe-harbor math handles the rest.
- Read off your quarterly payment and the remaining IRS deadlines. Nothing you typed leaves your device.
Three legal ways to shrink or erase the penalty
Withholding, retroactively. If you or a joint-filing spouse has any W-2 income, extra withholding between now and December is treated as paid evenly across the whole year — it back-fills the missed quarter in a way no estimated payment can. A new W-4 with an amount on line 4c is the mechanism.
The annualized-income method. If the payment you “missed” preceded the income itself — the client paid in September, the deadline was June — Form 2210’s Schedule AI computes each quarter’s requirement from income actually earned by then, often zeroing early-quarter penalties for back-loaded years. It’s tedious; tax software does it; it’s worth it when income was genuinely uneven.
The waiver, narrowly. The IRS can waive the penalty for casualty, disaster, retirement (over 62) or disability situations where the underpayment had reasonable cause — a real provision, but not a “I forgot” provision. For everyone else, the honest lever is speed: the penalty is time × amount, and you control the time.
Good to know
- Don’t wait for the next deadline to pay a missed quarter — deadlines are due dates, not payment windows; Direct Pay takes money any day of the year.
- The penalty caps per quarter at the filing deadline: an ignored 2026 Q1 shortfall stops accruing April 15, 2027 — but the meter’s running until then.
- If the year’s total will land under $1,000 owed after withholding, there’s no penalty to fear at all — check that box first in the calculator before panicking.
Frequently asked questions
How big is the penalty, actually?
It’s the IRS interest rate (set quarterly — 6–7% through 2026; the current figure is at irs.gov) applied to each quarter’s shortfall for the days it stayed unpaid, computed on Form 2210 when you file. Three months late on a $3,000 quarter at 7% is roughly $52 — annoying, not catastrophic. The daily accrual is why paying today beats paying at the next deadline.
Can I just double the next payment instead?
You can, but each shortfall keeps accruing until money actually arrives — doubling in September leaves the June gap collecting interest all summer, and the IRS credits payments to quarters chronologically. Paying the catch-up immediately, then the normal amount at the deadline, strictly dominates.
I missed every payment this year. Should I bother starting now?
Emphatically yes — every day of remaining accrual you prevent is money saved, and a December payment still stops the clock on everything it covers. Enter what you’ve paid (zero) above: the calculator splits the full obligation across whatever deadlines remain, and the withholding trick can rescue even a December discovery if there’s a W-2 in the household.