You can pay estimated taxes all at once, but the single payment has to reach the IRS by April 15 to cover the full year without penalty.1Internal Revenue Service. Estimated Tax – FAQs The IRS FAQ says it plainly: “you can make quarterly estimated tax payments or pay all of the amount due on the first quarterly payment due date.” What you cannot do is wait until later in the year and settle up with one check, because the IRS splits the year into four periods and checks each one separately.
Why the April 15 Date Matters
Each quarter’s compliance is measured by how much you’ve paid by that quarter’s deadline. A lump sum sent on April 15 satisfies the first quarter and, since the money is already sitting with the IRS, satisfies every quarter after it. A lump sum sent in July, October, or December leaves the earlier quarters underfunded even if the annual total is exactly right.
The 2026 quarterly deadlines are April 15, June 15, September 15, and January 15, 2027.2Office of the Law Revision Counsel. 26 U.S.C. 6654 – Failure by Individual to Pay Estimated Income Tax Miss the first one with a plan to catch up later, and the IRS calculates a penalty on the underpaid quarter running from its due date until you pay or until April 15 of the following year, whichever comes first. For the first quarter of 2026 the underpayment rate is 7% per year, compounded daily.3Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026
When Paying All at Once Makes Sense
The single-payment approach suits people with predictable annual income who would rather deal with estimated taxes once and be done. It’s clean. No calendar reminders, no partial payments to track, no risk of forgetting the September installment.
The tradeoff is opportunity cost. You are handing the IRS money months before it is technically due. On a $5,000 estimated tax bill that cost is modest. On a $50,000 bill, keeping the cash in a high-yield account and paying quarterly may return more than the convenience is worth. Run the numbers against whatever rate your bank is paying before you commit to a lump sum.
The Mistake to Avoid: Waiting Until Year-End
Sending one large payment in December or with your return in April does not work, even if the total is correct and you end up owing nothing or getting a refund. The IRS can still assess a penalty for each quarter that was underfunded along the way.1Internal Revenue Service. Estimated Tax – FAQs
There is one narrow escape hatch. If you file your return and pay the full balance by January 31, the penalty on the fourth-quarter installment is waived.2Office of the Law Revision Counsel. 26 U.S.C. 6654 – Failure by Individual to Pay Estimated Income Tax The first three quarters are still exposed. This is not a substitute for paying on time; it only softens the last quarter.
Withholding Is a More Flexible Alternative
If you also have a W-2 job alongside self-employment or investment income, you have a better option than a lump-sum estimated payment. Ask your employer to withhold extra tax by filing a new Form W-4 with an additional withholding amount.4Internal Revenue Service. Estimated Taxes
Withholding is treated as paid evenly across all four quarters regardless of when it was actually deducted. Estimated payments are only credited to the quarter you send them. That difference is genuinely useful: if you realize in October that you’re going to owe a big amount, bumping up W-4 withholding can retroactively cover the earlier quarters in a way that an October estimated payment cannot.
How to Send the Single Payment
Once you know the amount, several channels will take the payment. The fees vary more than you might expect.
IRS Direct Pay
Direct Pay moves money from a bank account to the IRS for free, with no account or sign-up. Choose “Estimated Tax” as the reason and 2026 as the tax year so the payment lands in the right bucket.5Internal Revenue Service. Direct Pay with Bank Account You can schedule the payment in advance and cancel or change it up to two business days before the scheduled date. The per-payment ceiling is $10 million, so large lump sums are fine.
EFTPS
The Electronic Federal Tax Payment System is also free but requires enrollment, and the IRS mails a PIN to your address on file. Setup takes roughly five to seven business days, so this is not the tool for someone deciding on April 12 to pay everything at once.6Internal Revenue Service. EFTPS: The Electronic Federal Tax Payment System Same-day payments are capped at $1 million per transaction.
Credit or Debit Card
Card payments go through IRS-authorized processors that charge a convenience fee the IRS does not receive. Credit card fees typically run from 1.75% to about 2.95% of the payment, with a $2.50 minimum.7Internal Revenue Service. Pay Your Taxes by Debit or Credit Card or Digital Wallet On a $10,000 payment that’s $175 to $295 in fees. Unless the rewards clearly beat the fee, this is an expensive way to pay.
Paper Check
If you prefer mailing a check, use Voucher 1 from Form 1040-ES for a lump-sum April 15 payment. Write your Social Security number and “2026 Form 1040-ES” on the check, and mail it early enough to arrive by April 15 rather than just be postmarked by it.8Internal Revenue Service. 2026 Form 1040-ES Estimated Tax for Individuals
Getting the Amount Right
Paying the full year up front only helps if the amount actually covers your liability. You generally owe estimated taxes at all if you expect to owe $1,000 or more after withholding and refundable credits.4Internal Revenue Service. Estimated Taxes To avoid a penalty, the IRS wants you to hit one of two safe-harbor targets: 90% of your actual current-year tax, or 100% of the tax on your prior-year return, whichever is smaller.9Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
The prior-year figure is popular because you already know it. There’s a catch for higher earners: if your prior-year adjusted gross income exceeded $150,000 ($75,000 if married filing separately), the prior-year safe harbor rises to 110%.10Office of the Law Revision Counsel. 26 U.S.C. 6654 – Failure by Individual to Pay Estimated Income Tax So if your prior-year tax was $20,000, your single April payment needs to be at least $22,000 to be fully protected.
The Estimated Tax Worksheet inside Form 1040-ES walks through the calculation: project gross income, subtract adjustments, apply deductions and credits, arrive at total tax, then subtract expected withholding to find the gap.8Internal Revenue Service. 2026 Form 1040-ES Estimated Tax for Individuals If you’re rolling a 2025 refund forward, subtract it from your first installment on the worksheet rather than adding it to the check; the overpayment credit is treated as applied on April 15.
One useful exemption: if your prior-year tax liability was zero and the prior year was a full 12-month tax year during which you were a U.S. citizen or resident, you owe no estimated tax penalty for the current year at all.11Internal Revenue Service. Penalty Questions This most often applies to someone who had no income the year before and is now starting a business or freelance work.
State Estimated Taxes Are Separate
A federal lump-sum payment on April 15 does nothing for your state. Most states with an income tax have their own estimated payment rules, with liability thresholds ranging from around $100 to $1,000 and deadlines that usually but not always mirror the federal schedule. Check your state’s department of revenue before assuming you’re covered.