Here's a tax rule that most NJ homeowners either don't know about or misunderstand: when you sell your primary residence, you can exclude up to $250,000 of profit from capital gains tax (or $500,000 if married filing jointly). For most NJ sellers, this means owing nothing in federal capital gains tax.
The Basic Rule (IRC Section 121)
To qualify for the exclusion, you must meet two tests:
- Ownership test: You owned the home for at least 2 of the last 5 years
- Use test: You used the home as your primary residence for at least 2 of the last 5 years
These two years don't have to be consecutive, and you can use this exclusion once every two years.
How Much Can You Exclude?
- Single filers: up to $250,000 of gain excluded
- Married filing jointly: up to $500,000 of gain excluded
Real NJ Example
A married couple bought their Morris County home in 2008 for $380,000. They sell in 2025 for $780,000. Their capital gain is $400,000. Under the Section 121 exclusion, they can exclude up to $500,000 — so their entire $400,000 gain is excluded. Federal capital gains tax: $0.
What About NJ State Tax?
New Jersey follows the federal exclusion — NJ also allows you to exclude the same amount from NJ income tax. However, NJ does require you to pay an estimated tax called the NJ Exit Tax at closing (officially called the "Estimated Income Tax Payment for Non-Residents"). This is a prepayment, not an additional tax — you reconcile it when you file your NJ return. If the exclusion wipes out your gain, you'll get the Exit Tax payment back.
Situations That Reduce or Eliminate the Exclusion
- Home office deductions: If you deducted a home office, that portion may not qualify
- Rental use: Years where the home was rented (not used as your residence) may reduce the exclusion amount
- Shorter ownership: If you've owned less than 2 years but have a qualifying reason (job change, health, unforeseen circumstances), you may get a partial exclusion
- Divorce: Special rules apply — generally favorable for the spouse who receives the home
What If My Gain Exceeds the Exclusion?
If your gain is larger than the exclusion, you pay long-term capital gains tax on the excess amount at 0%, 15%, or 20% depending on your total income. For most middle-income NJ sellers, the rate is 15% federal plus NJ's graduated income tax (up to ~10.75% for high earners).
Planning Opportunity
If you're considering selling but haven't lived in the home for 2 of the last 5 years (for example, you moved out and rented it), moving back in for 2 years before selling could save you six figures in taxes. This is worth a conversation with a CPA before making any decisions.
This article is educational only. Tax law is complex and individual circumstances vary significantly. Consult a licensed CPA before making tax-related decisions about your property.