Buying A Home: Tax Benefits
A guide by Taxstra Tax & Accounting — CPA-led tax strategy for business owners
Mortgage Interest Deduction
Deductible on loans up to $750k principal
Mortgage interest is deductible on debt up to $750,000 (for loans originated after December 16, 2017; older loans: $1M limit) secured by your home. To claim, you must itemize deductions (standard deduction is $29.2k MFJ 2026). Many homeowners don't itemize because standard deduction exceeds mortgage + property tax deductions.
Mortgage Interest Deduction Example
Home price: $500k. Mortgage: $400k at 6% interest. Year 1 interest: $24k. If itemizing, deduction: $24k. Tax saving: $24k × 24% = $5,760/year. Over 30 years (declining), cumulative saving: ~$90k (vs $0 if standard deduction exceeds itemized).
The key decision: itemize or take standard deduction? Standard deduction (2026): $29.2k MFJ. Itemized deductions: mortgage interest ($24k) + property tax ($10k SALT cap) = $34k. Result: itemize ($34k exceeds $29.2k standard). Gain: $4,800 deduction × 24% = $1,152/year.
Bunching Strategy for Itemization
If mortgage interest + SALT cap hit ~$28k-$29k (close to standard), consider "bunching" deductions. Prepay next year's property tax in December (itemize year 1 with bunched deduction). Skip deductions in year 2 (take standard deduction). Alternate years maximize total deductions over 2 years.
Homeowners Often Don't Itemize
High standard deduction ($29.2k MFJ) means many homeowners can't exceed it with mortgage + property tax. Example: $400k mortgage at 6% = $24k interest. Add $10k property tax (SALT cap) = $34k itemized. Advantage over standard: $4.8k deduction = $1.15k tax savings. Modest benefit; many homes don't justify itemizing.
SALT Cap & Property Taxes
$10k annual limit on state/local taxes (through 2025)
The State and Local Tax (SALT) cap limits deduction to $10k/year. Covers state income tax + property taxes + sales tax (elect one). Applies through 2025; may expire Dec 31, 2025 (Congress may extend). For homeowners in high-tax states (CA, NY, IL, NJ), the cap is painful: property tax alone often exceeds $10k.
SALT Cap Impact Example
Home value: $1M in San Francisco. Property tax (1.25% CA): $12.5k/year. Cap: $10k deductible. Loss: $2.5k/year × 24% bracket = $600/year in tax. Over 20 years: $12k in non-deductible tax. Homeowners in CA, NY, NJ, IL hit cap frequently.
Two-property owners (primary + vacation home): combined property taxes on both hit cap even faster. Example: primary home $800k (CA), vacation home $400k (CO). Combined property taxes: ~$12k CA + $2k CO = $14k. Capped at $10k. Non-deductible: $4k × 24% = $960/year loss.
SALT Cap Expiration Planning
If SALT cap expires 12/31/25 (decision pending in Congress), deductions return to unlimited in 2026. High-property-tax homeowners: monitor tax law. If cap expires, consider deferring property tax payments to 2026 to claim unlimited deduction. Consult CPA in November 2025.
PMI & Closing Costs
Deductibility of mortgage insurance and purchase fees
Private Mortgage Insurance (PMI): required when down payment is under 20%. If financed into mortgage (not paid at closing), PMI may be deductible as mortgage insurance (similar to mortgage interest deduction). Subject to income limits: phases out at $160k single, $240k MFJ (2026).
PMI Deduction Example
Home: $400k. Down payment: 5% ($20k). Financed mortgage: $380k. PMI: $15k (amortized). Deductible PMI (recent rule): up to $1.5k/year if income under threshold. Tax saving: $1.5k × 24% = $360/year. Phases out above $160k/$240k.
Closing costs: mostly not deductible. Points (discount points, loan origination fees): deductible if used to buy down interest rate (amortized over loan term) or non-deductible if financing fees. Appraisal, inspection, title insurance, recording fees: capitalized into basis, recovered at sale via reduced capital gains.
Closing Cost Capitalization
$15k closing costs (appraisal $500, inspection $400, title $1.2k, attorney $2.5k, recording $300, origination $2k, transfer tax $8k): capitalized into basis. You don't deduct in year 1. At sale, use improved basis (original price + closing costs) to calculate capital gains (lower gains = lower tax).
Home Office Deduction
If using dedicated space for business
Home office deduction available if you use a dedicated space regularly for business (self-employed, business owner, or employee with home office). Two methods: simplified ($5/sq ft, max 300 sq ft = $1.5k/year) or regular (actual expenses: utilities, depreciation, mortgage interest, property tax, insurance, repairs).
Simplified Home Office Method
300 sq ft home office × $5/sq ft = $1.5k/year deduction (cap). No depreciation recapture at sale. Easy tracking. Best for smaller offices. Does not require itemization; deductible against business income.
Regular method: allocate all home expenses by square footage. Example: 4,000 sq ft home, 400 sq ft office = 10% allocation. Mortgage interest ($24k) × 10% = $2.4k deductible. Property tax ($10k SALT cap) × 10% = $1k deductible. Insurance ($2k) × 10% = $200. Depreciation: depreciate 10% of home value annually (triggers recapture tax at sale).
Depreciation Recapture on Home Sale
Using regular home office method triggers depreciation recapture. If you depreciate $5k over 5 years and sell home, you owe 25% recapture tax on $5k = $1.25k tax. Compare this to potential home office deductions ($3k-$5k/year). For most homeowners, simplified method is better (avoids recapture).
Home Improvements & Basis
Capitalization and recovery at sale
Home improvements (new roof, addition, renovation, HVAC) are capitalized into your cost basis. Not deductible in year incurred. Cost basis increases by improvement cost. At sale, capital gains = sale price - (original cost + improvements).
Home Improvement Basis Example
Bought home: $300k. Renovated kitchen: $50k. New roof: $15k. Cost basis: $365k. Sold 5 years later for $450k. Capital gains: $450k - $365k = $85k (vs $150k if no improvements). Section 121 exclusion ($500k MFJ): $85k taxable = $0 tax (under exclusion). Improvements reduced gain, saved capital gains tax.
Repairs vs improvements: repairs (fixing existing, maintenance) vs improvements (adding value, new systems). Roof repair $2k: repair (no deduction, not capitalized). New roof $15k: improvement (capitalized). The distinction matters: capital vs expensed.
| Metric | Renter | Homeowner |
|---|---|---|
| Home Purchase Price / Basis | N/A (renting) | Purchase price + closing costs capitalized. Cost basis for future sale. |
| Annual Mortgage Interest Deduction | $0 (rent not deductible) | Up to $750k debt limit: $750k × 6% = $45k deductible (if itemizing) |
| Annual Property Tax Deduction (SALT Cap) | $0 (rent not deductible) | Up to $10k/year (federal cap through 2025, may extend or expire) |
| Homeowner Insurance / HOA | Renters insurance: ~$15-25/month ($180-300/year); not deductible | Homeowner insurance: ~$100-200/month ($1.2k-2.4k/year); not deductible |
| Maintenance / Repairs | Landlord maintains; no cost to renter | Your responsibility; roof, HVAC, plumbing: $500-$2k/year; not deductible |
| Home Improvement Investments | None; can't improve rental property | New roof $12k, addition $50k, etc. capitalized into basis (recovered at sale) |
| Capital Gains on Sale (After 2 Years) | N/A (no property to sell) | Section 121 exclusion: $250k single, $500k MFJ. Gain over exclusion taxed 15%-20% |
| PMI Deduction (If Over 80% LTV) | N/A | PMI deductible if financed; phases out at $160k single, $240k MFJ (2026) |
| Home Office Deduction (If Applicable) | Can deduct home office if renting (office % of rent non-deductible) | Deductible: simplified $5/sq ft (300 sq ft max = $1.5k/year) or actual expenses |
| 10-Year Housing Cost Comparison: $400k Purchase, 3% Down | Rent $2k/month × 120 months = $240k out-of-pocket (zero equity, zero tax benefits) | Mortgage $388k at 6%, taxes/insurance $4.8k/year, upkeep $8k/year. Total cash out: $350k over 10 years. Remaining mortgage: $280k. Home value (assume 3% appreciation): $537k. Equity: $257k. Tax benefits: ~$85k (mortgage interest + property tax deductions). |
| Liquidity | Liquid; move easily; no sale process | Illiquid; 30-60 days to sell; selling costs 5-7% of sale price |
Frequently Asked Questions
10 homeowner tax questions answered
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