H&R Block charges for an amended return the same way it charges for any in-office work: by the form. Pricing starts around $99 plus a state filing fee for the simplest correction, but most filers end up paying between $200 and $500 once the affected schedules, state returns, and any reconstruction of a return prepared elsewhere are added in. Complex amendments involving self-employment or rental income can run $700 or more.1H&R Block. Know the Cost of Tax Preparation with H&R Block Upfront Pricing
The In-Office Price Floor and What Sits On Top
The roughly $99 starting price assumes the simplest possible situation: an otherwise straightforward return where one number changes, such as a corrected W-2 amount. State filing is a separate fee. Every additional schedule the tax pro has to touch adds its own per-form charge, so the final bill is really a stack.
Whether H&R Block prepared your original return matters a lot. If it did, the office already has your return in its system and the tax pro is only working on the changed pieces. If someone else prepared it, the pro has to rebuild the entire original return in H&R Block’s software before amending anything. You end up paying for a full return preparation on top of the amendment itself. For a moderately complex return, that reconstruction alone can run $150 to $250, which is why combined work commonly lands in the $300 to $500 range before state filings.
What Pushes the Cost Higher
Complexity of the correction is the biggest driver. Adding a missed 1099-INT is not the same job as reworking a Schedule C for self-employment or a Schedule E for rental property. Those schedules mean expense documentation and recalculation, which means more professional time and more per-form fees. As a reference point, H&R Block’s online self-employed product runs $130 plus $49 per state, and equivalent work in the office tends to cost more.2H&R Block. Best Tax Software for Self Employed
Two other things multiply the bill. Amending multiple tax years means multiple full returns, each with its own fee structure. And if your federal change affects state tax, each state amendment is a separate return with its own preparation fee.
When You Pay Nothing
Before writing a check, check whether an H&R Block guarantee already covers you.
Under the Maximum Refund Guarantee, if you find an H&R Block error that entitles you to a larger refund or a smaller tax bill, H&R Block refunds your original preparation fee and files the amended return at no additional charge. This applies to in-office and online filings.3H&R Block. Guarantees
The 100% Accuracy Guarantee is separate and works differently: if an H&R Block error results in penalties or interest, H&R Block reimburses those costs, with no dollar cap for in-office clients and a $10,000 cap for online and software customers. It does not apply if the error came from incomplete or inaccurate information you provided, or from tax law changes after October 15 of the filing year.3H&R Block. Guarantees
H&R Block also sells a Peace of Mind Extended Service Plan, typically around $40, that covers IRS notice management, audit representation, and up to $6,000 in reimbursement if an H&R Block error increases your tax. It has to be purchased at the time of original filing; it won’t retroactively pay for an amendment you already need.4H&R Block. Return and Tax Audit Protection with Peace of Mind
The Cheaper Route: Amending It Yourself
Form 1040-X is free to download from the IRS, and H&R Block online customers can amend through the same account they used originally. Free-tier users have to upgrade to a paid product to e-file the amendment.5H&R Block. File an Amended Return Online with H&R Block For older years, H&R Block sells back editions of its desktop software, with pricing that varies by year.6H&R Block. Download Tax Software Back Editions and Updates
Doing it yourself is reasonable for a missing 1099-INT, a transposed W-2 number, or a credit you forgot to claim. It’s riskier where the math is interdependent: self-employment income, depreciation, capital gains. A botched amendment can invite IRS scrutiny, and that’s where paying a professional buys real protection.
The IRS Bill That Comes With Owing More
H&R Block’s fee isn’t the whole cost of amending. If the amendment shows you owe additional tax, the IRS charges penalties and interest running from the original filing deadline, not from the amendment date.
The failure-to-pay penalty is 0.5% of the unpaid tax for each month or partial month it stays outstanding, capped at 25%. It drops to 0.25% per month if you’re on an installment agreement and filed the original return on time, and it climbs to 1% per month if the IRS issues a notice of intent to levy and you don’t pay within 10 days.7Internal Revenue Service. Failure to Pay Penalty
Interest is separate and compounds daily. For the first quarter of 2026, the rate is 7% per year, and it adjusts quarterly. If the amendment produces a refund instead, the IRS pays you interest at the same 7% on the overpayment.8Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026
Don’t Wait Past the Refund Deadline
If the amendment would give you a refund, you have three years from the date you filed the original return or two years from the date you paid the tax, whichever is later. Filing early counts from the April deadline, not your actual filing date. Miss the window and any refund is forfeited. If you owe more, the IRS can still assess it after that window closes, so waiting doesn’t help.9Internal Revenue Service. File an Amended Return