Underpayment Penalty for H-1B Visa Holders (Form 2210)

The IRS expects you to pay taxes throughout the year, not just at filing time. If you fall short, Form 2210 calculates a penalty that can run into hundreds of dollars — and RSU income makes this trap especially common for H-1B workers in tech.

What the Underpayment Penalty Is

The US tax system is pay-as-you-go. Wages are covered through employer withholding. But any income that does not flow through payroll — RSU proceeds sold after vesting, self-employment income, rental income from India, dividends, or capital gains — has no automatic withholding. You are expected to either increase your W-4 withholding or make quarterly estimated tax payments to cover the shortfall.

When you underpay during the year, the IRS charges a penalty under IRC §6654. Form 2210 is the worksheet that calculates whether the penalty applies and, if so, how much. The penalty is based on the federal short-term interest rate plus 3 percentage points, applied to the underpaid amount for each quarter it was underpaid.

The IRS computes this automatically using information on your return, so many filers never need to attach Form 2210. However, you must attach it if you are using the Annualized Income Installment Method to reduce the penalty, or if you are claiming a waiver.

The Two Conditions That Trigger the Penalty

You are subject to the underpayment penalty only if both of the following conditions are true:

If either condition fails, the penalty does not apply. This is why the safe harbor rules are so useful — if your prior-year tax liability was moderate, you can avoid penalties by simply matching that amount in withholding this year.

Safe Harbor Rules in Detail

There are three ways to avoid the underpayment penalty entirely:

1. 90% of current year tax. Pay at least 90% of your actual 2026 tax liability through withholding and estimated payments, spread across all four quarters.
2. 100% of prior year tax (the most common harbor). Pay at least 100% of your 2025 tax liability through any combination of withholding and estimated payments. If your 2025 AGI exceeded $150,000, the threshold rises to 110% of the prior year tax.
3. Tax owed is less than $1,000. As noted above, if your balance due is under $1,000, the penalty does not apply.

The 100%/110% prior-year safe harbor is the most reliable strategy because it is based on a known number — your last filed return — rather than an estimate of the current year. Simply divide your prior year total tax by 4 and pay that amount each quarter.

Quarterly Payment Deadlines

Estimated payments are due on a schedule that does not match calendar quarters. For tax year 2026:

Note that Q2 covers only two months of income (April–May), while Q4 covers four months. This uneven structure is why the Annualized Income Installment Method can help if your income is concentrated in the second half of the year.

How the Penalty Is Calculated

For each quarter where you underpaid, the IRS applies the federal short-term rate plus 3 percentage points to the shortfall for the number of days in the quarter. The rate adjusts each quarter.

Short Method vs. Annualized Income Installment Method

Form 2210 offers two calculation methods. Most filers use the Short Method, but H-1B holders with lumpy income — especially RSU vestings concentrated in Q3 or Q4 — often benefit from the Annualized Income Installment Method.

The Annualized Method requires attaching Schedule AI to Form 2210 and tracking your income and deductions by quarter. It is more work, but for filers who received a large RSU vesting in October or November, it can reduce a four-figure penalty to near zero.

Why H-1B Holders Are Disproportionately Affected

Most H-1B holders work in technology, finance, or consulting — sectors where equity compensation is significant. RSUs create a particular underpayment problem:

• Withholding rate mismatch. When RSUs vest, your employer withholds at the 22% supplemental rate (37% above $1 million). If you are in the 32% or 35% bracket, the gap is immediate and substantial.
• Lumpy vesting schedules. A four-year cliff vest means all shares arrive in one quarter. Your withholding for Q1–Q3 looks adequate, then a large vesting in Q4 pushes you far into underpayment territory.
• Indian investment income. Dividends from NRO accounts, interest from NRE accounts (once you become a US resident), or capital gains from Indian mutual fund sales are not subject to any US withholding. If you do not make estimated payments, this income is unpaid until April.
• H-4 EAD spouse income. A spouse who earns self-employment income on an H-4 EAD has no employer to withhold taxes. Every rupee of consulting revenue creates an underpayment exposure unless quarterly estimates are made.

See Quarterly Estimated Tax Payments for a practical guide to calculating and making those payments, and RSU Taxation & the $0 Cost Basis Problem for a deep dive on how RSU vesting income flows into your tax return.

Penalty Waivers

The IRS may waive the underpayment penalty in limited circumstances. The most commonly applicable waivers for H-1B filers are:

• Casualty, disaster, or unusual circumstance. If the underpayment was caused by a federally declared disaster or circumstances beyond your control (job loss, medical emergency), you can request a waiver on Form 2210 Part II, Box A.
• Retired or disabled in the current or prior year.If you turned 62 or became disabled and your underpayment was due to reasonable cause, the waiver may apply. Rare for H-1B holders but worth noting.
• Tax-year change or amended return. If an error in a prior return created the underpayment, the IRS has discretion to waive the penalty.

General financial stress or simply forgetting to make estimated payments does not qualify as reasonable cause. If you missed a quarterly payment because of a large unexpected RSU vesting, your best path is usually the Annualized Income Installment Method rather than seeking a waiver.

Common Mistakes

1. Assuming W-2 withholding is enough. Employer withholding only covers wages. RSU proceeds, Indian dividends, and freelance income are all outside the payroll system.
2. Using only the 90% test and ignoring the 110% harbor. If your AGI exceeded $150,000 last year, the 100% prior-year harbor becomes 110%. Many filers use 100% and still owe a penalty.
3. Counting federal withholding from W-2 as covering all quarters equally. The IRS allows you to allocate actual withholding to each quarter (based on when it was withheld), which sometimes helps avoid early-quarter penalties. Most tax software handles this automatically.
4. Not attaching Form 2210 when using the Annualized Method. If you claim reduced penalties using Schedule AI, you must attach the completed form. Filing without it means the IRS computes the penalty under the Short Method, which is always less favorable.
5. Paying the Q4 estimated payment in December instead of January. The Q4 due date is January 15 of the following year. Paying in December does not help your Q3 penalty but may help you avoid the Q4 underpayment charge.

How Our Platform Handles This

H1B TaxFile automatically evaluates whether Form 2210 applies to your return:

• After you enter all income sources, the platform computes your required annual payment under both the 90% current-year and 100%/110% prior-year safe harbors.
• If your withholding and estimated payments fall short of both safe harbors, the platform calculates the underpayment penalty by quarter using the applicable IRS rate.
• For H-1B holders with RSU income concentrated in Q3 or Q4, the platform automatically evaluates whether the Annualized Income Installment Method would reduce the penalty and presents both calculations side by side.
• The underpayment penalty flows to Form 1040 Line 38 in the final PDF. Schedule AI is included in the output when the Annualized Method produces a lower penalty.