NJ First-Time Homebuyer Tax Guide: What You Can Deduct After Buying in New Jersey (2025)

Buying a home in New Jersey is a major financial commitment — and it comes with a new set of tax implications at both the federal and state level. This guide walks through every tax deduction and credit available to NJ homeowners in their first year and beyond, including things that are specific to NJ and things federal-only guides often miss.

Year One: What Changes on Your Tax Return After Buying

In the year you buy your home, you’ll likely cross the threshold where itemizing deductions on your federal Schedule A becomes worthwhile — especially in NJ where property taxes and mortgage interest are both significant. Compare your potential itemized deductions to the 2025 standard deduction ($15,000 single / $30,000 married filing jointly) to decide which to take.

Mortgage Interest Deduction

Interest paid on your primary mortgage is deductible on federal Schedule A (up to $750,000 of acquisition debt for loans originated after December 15, 2017). In NJ, mortgage interest is also deductible on the NJ-1040 — and NJ does not impose the $750,000 federal cap. If your loan exceeds $750,000 (common in Morris, Bergen, Essex, and Hudson County), NJ allows the full interest deduction while federal only allows a portion.

NJ home prices have soared — median prices in many NJ suburbs now exceed $600,000 and routinely reach $800,000–$1.2 million in premium towns. For buyers with jumbo mortgages, the NJ-vs-federal difference on mortgage interest is meaningful.

Property Tax Deduction: Federal Is Capped, NJ Isn’t (Much)

Federally, property taxes (plus all other state and local taxes) are capped at $10,000 on Schedule A. For most NJ homeowners, property taxes alone exceed $10,000 — the federal deduction is fully capped and provides limited benefit.

On your NJ-1040, the property tax deduction is up to $15,000 — and it applies independently of the federal cap. In your first year, you’ll deduct the property taxes you actually paid (typically fewer months if you bought mid-year and the seller paid some at closing). In subsequent years, you’ll deduct a full year.

Mortgage Points: Deductible in Year One

If you paid points to reduce your mortgage interest rate (each point = 1% of the loan amount), those points are fully deductible in the year you bought your home on your federal return — as long as they meet IRS requirements (paid to buy or improve your primary home, not refinanced). On a $500,000 mortgage with 1 point paid, that’s $5,000 deductible in year one. NJ follows federal treatment for points.

The NJ Mansion Tax

NJ imposes a 1% “mansion tax” on residential property purchases of $1 million or more. This is paid by the buyer at closing. The mansion tax is not federally deductible as a current expense, but it can be added to your home’s cost basis — which reduces capital gains when you eventually sell. Keep closing documents noting the mansion tax paid.

NJ Realty Transfer Fee

The NJ Realty Transfer Fee (RTF) is a state transfer tax paid by the seller in most transactions (with some exceptions for certain buyers). If you’re a buyer, you typically don’t pay the RTF directly — but if you’re purchasing from an estate or in a transaction where the seller shifts costs, you might. The RTF paid by a seller is deductible as a selling expense when computing their NJ capital gain, not on the buyer’s return.

Homestead Exemptions and Assessment Limits: Apply in Year One

Once you own your home, make sure you apply for all applicable NJ property tax programs in your first year. Many have annual deadlines:

ANCHOR program — apply by the deadline each fall for the prior year’s benefit. If you owned and occupied your home on October 1, you’re eligible. First-time homeowners often miss the first year’s application.
Veterans’ deduction ($250) — if you’re an honorably discharged veteran, file Form D-DV with your local tax assessor. This is a one-time application that continues each year automatically.
Senior Freeze — if you’re 65+ or disabled, apply in your first year of homeownership to establish your base year as early as possible

NJ Homeowner Deductions That Don’t Exist Federally

A few NJ-specific benefits federal tax guides won’t mention:

$15,000 property tax deduction on NJ-1040 — separate from and in addition to your federal Schedule A
Full mortgage interest deduction without the $750K federal cap — NJ doesn’t impose this limit
NJ medical expense deduction at 2% threshold — lower threshold means more NJ residents qualify for the state medical deduction even when they can’t claim it federally

What New NJ Homeowners Often Get Wrong

Assuming ANCHOR doesn’t apply their first year — if you owned and occupied on October 1, you qualify from day one
Not tracking home improvements — additions, renovations, and improvements add to your home’s cost basis, reducing future capital gains when you sell. Keep all receipts from the start.
Forgetting NJ’s non-conformity rules — NJ’s separate tax calculation means your federal AGI isn’t the starting point in NJ. Some federal deductions (health insurance for self-employed, IRA contributions) don’t carry over.
Missing the mansion tax basis add-on — if you paid it, record it with your closing documents as an addition to cost basis

When to Consider an NJ Tax Professional

Your first year as an NJ homeowner is a good time to consult a NJ-based CPA or tax professional — especially if you also have self-employment income, work in New York, or have significant investments. The interplay between NJ and federal returns is complex, and the year you buy is when the most options exist and when the most mistakes are made.