
New Hampshire is often celebrated for having no broad‑based personal income tax on wages, yet savvy taxpayers still benefit from understanding New Hampshire state income tax deductions that can reduce liability on interest, dividends, and certain business earnings. In this article we’ll explore the NH tax deductions that apply to the limited income streams the state does tax, uncover NH tax credits and exemptions you might overlook, and walk you through the filing process so you can claim every eligible write‑off with confidence. Whether you’re a freelancer, investor, or small‑business owner, knowing how to leverage NH tax benefits can make a noticeable difference when it’s time to settle your bill with the Granite State.
Understanding New Hampshire’s Tax Structure
Unlike most states, New Hampshire does not impose a tax on earned income such as salaries or wages. Instead, the state levies a 5 % tax on interest and dividends (often referred to as the I&D tax) and applies business profits taxes to entities like corporations and LLCs. Because the tax base is narrow, New Hampshire state income tax deductions focus primarily on reducing the amount of taxable interest, dividend, and business income. Knowing which expenses qualify can turn a seemingly modest tax bill into a meaningful savings opportunity.
Key Deductions for Interest and Dividend Income
- Qualified Mortgage Interest – If you have a mortgage on a New Hampshire property, the interest paid may be deducted from your taxable interest income, subject to federal limits.
- Investment Advisory Fees – Fees paid to financial planners or investment managers for managing dividend‑producing portfolios are deductible.
- State and Local Taxes (SALT) Limitation Work‑around – While New Hampshire has no income tax, property taxes paid can sometimes be allocated against dividend income when filing federal returns, indirectly lowering your NH I&D tax base.
- Retirement Account Distributions – Certain withdrawals from IRAs or 401(k)s that are classified as interest or dividends may qualify for deductions if rolled over or transferred correctly.
Deductions Available to Business Owners
New Hampshire’s Business Profits Tax (BPT) and Business Enterprise Tax (BET) allow several deductions that parallel federal business write‑offs:
- Cost of Goods Sold (COGS) – Direct materials and labor involved in producing goods can be subtracted from gross receipts.
- Employee Wages and Benefits – Salaries, health insurance, retirement contributions, and other fringe benefits are deductible.
- Rent and Utilities – Office or retail space costs, electricity, heating, and internet services qualify.
- Depreciation – Capital assets such as equipment, vehicles, and buildings can be depreciated over their useful lives.
- Professional Services – Legal, accounting, and consulting fees directly related to your business are deductible.

How to Claim Your Deductions
- Gather Documentation – Collect mortgage statements, investment fee invoices, property tax receipts, and business expense records.
- Complete Form DP‑10 – This is the New Hampshire Interest and Dividends Tax Return. Enter your gross interest and dividend income, then subtract allowable deductions in the “Adjustments to Income” section.
- File Form BPT‑100 / BET‑10 – For business profits and enterprise taxes, report gross receipts, then deduct COGS, wages, rent, utilities, depreciation, and professional fees as instructed on the respective forms.
- Review Credits – New Hampshire offers credits such as the Research and Development Tax Credit and Economic Revitalization Zone Tax Credit that can further reduce your BPT or BET liability.
- Submit by Deadline – Returns are due April 15 (or the next business day if the 15th falls on a weekend/holiday). Electronic filing via the NH Department of Revenue Administration portal speeds processing and reduces errors.
Tips for Maximizing Your Savings
- Bundle Expenses – Timing large deductible purchases (e.g., equipment upgrades) within the same tax year can increase your depreciation and COGS deductions.
- Leverage Retirement Plans – Contributing to a SEP‑IRA or Solo 401(k) not only reduces federal taxable income but can also lower the amount of business profits subject to BPT.
- Stay Updated – Tax laws evolve; periodically check the NH Department of Revenue website for new credits, changes to deduction limits, or filing procedure updates.
- Consult a Professional – A CPA familiar with New Hampshire’s unique tax regime can identify niche deductions you might miss, especially if you have multi‑state income or complex investment structures.
Common Pitfalls to Avoid
- Overlooking the I&D Tax – Assuming you owe nothing because there’s no wage tax can lead to unexpected bills and penalties.
- Misclassifying Income – Ensure you correctly distinguish between interest, dividends, and capital gains; only the first two are subject to the 5 % I&D tax.
- Missing State‑Specific Forms – Using only federal schedules (e.g., Schedule B) without filing DP‑10 will result in non‑compliance.
- Neglecting Estimated Payments – If you expect to owe more than $500 in I&D tax, make quarterly estimated payments to avoid underpayment penalties.

FAQs
Q: Does New Hampshire tax my salary or wages?
A: No, the state does not impose a tax on earned income such as salaries or wages.
Q: What income is subject to New Hampshire’s 5 % tax?
A: Interest and dividends earned by individuals, as well as business profits subject to the Business Profits Tax and Business Enterprise Tax.
Q: Can I deduct mortgage interest on my NH tax return?
A: Yes, qualified mortgage interest can be subtracted from your taxable interest and dividend income on Form DP‑10.
Q: Are there any tax credits available for New Hampshire businesses?
A: Yes, credits include the Research and Development Tax Credit and Economic Revitalization Zone Tax Credit, which can reduce BPT or BET liability.
Q: When is the New Hampshire tax return due?
A: Returns are generally due April 15, with extensions available if needed.