You can't fully "write off" your entire mortgage, but you can deduct the interest paid on up to $750,000 of mortgage debt for your primary home and one other home if the funds were used to buy, build, or substantially improve it, by itemizing deductions on Schedule A. You must receive Form 1098 from your lender and compare your total itemized deductions (including mortgage interest, property taxes, etc.) to the standard deduction to see if itemizing saves you more money.
Mortgage amount
Taxpayers can deduct the interest paid on qualified residences for up to $750,000 in total mortgage debt (the limit is $375,000 if married and filing separately). Any interest paid on first, second or home equity mortgages over this amount is not tax-deductible.
A recent tax law ("One Big Beautiful Bill") introduced a new $6,000 bonus deduction for Americans aged 65 and older, available for tax years 2025-2028, reducing taxable income, not the tax itself, with income phase-outs starting at $75,000 MAGI for singles and $150,000 for joint filers. This deduction adds to existing standard deductions, provides up to $12,000 for couples, and requires a Social Security number and filing status other than Married Filing Separately.
The main tax benefit of owning a house is that the imputed rental income homeowners receive is not taxed. Although that income is not taxed, homeowners still may deduct mortgage interest and property tax payments, as well as certain other expenses from their federal taxable income, if they itemize their deductions.
The IRS allows taxpayers to deduct up to $3,000 of realized investment losses ($1,500 if married filing separately) against ordinary income each year. This deduction applies only to losses in taxable investment accounts and must be realized by December 31st to count for that tax year.
The IRS doesn't have a specific dollar limit for hobby income; instead, it focuses on profit motive: if you intend to make a profit, it's a business, but if it's for fun, it's a hobby, and you must report all income but can't deduct losses. Key is that you report all hobby income on Form 1040 as "other income," and if net earnings from self-employment are $400 or more, you owe self-employment tax, even if it's a side gig. The main difference from business is that you can't deduct hobby expenses (under current law) and must report all profits.
To qualify as a capital improvement, the IRS states that the property must meet the following conditions: The improvement “substantially adds” value to your home. The improvement prolongs the useful life of the property. The improvement is permanent.
You can deduct mortgage interest on up to $750,000 of debt for your primary and one second home (or $375,000 if married filing separately) for loans taken out after December 15, 2017; older mortgages (before that date) have higher limits of $1 million ($500,000 if married filing separately). The interest must be on qualified residences, and you must itemize deductions; home equity loan interest is only deductible if used for home improvements.
Many business expenses are 100% deductible, including advertising, employee wages, rent, supplies, and certain business meals like company parties or meals for the public, while personal deductions like student loan interest or charitable donations (depending on the type) can also be fully deductible for individuals. The key is that the expense must be "ordinary and necessary" for your trade or business or meet specific IRS criteria, often differentiating from the 50% rule for client meals.
Mortgage Interest Deductions
For most homeowners, the biggest tax benefit of owning a home in California comes from the mortgage interest deduction. Your mortgage lender will provide you with an IRS Form 1098 at the end of each year that itemizes how much you paid in interest on your loan.
You can claim a basic rate relief tax reduction. The below table shows how this changed over the years from 2017 to 2021. The reduction is the basic rate value of 20%, applied to the lowest of: Finance costs like mortgage interest, loads to buy furnishings, and fees acquired when taking out or repaying mortgages/loans.
In most cases, you can deduct all of your home mortgage interest. How much you can deduct depends on the date of the mortgage, the amount of the mortgage, and how you use the mortgage proceeds.
The IRS $600 rule refers to a change in reporting requirements for third-party payment apps (like Venmo, PayPal) for taxable income from goods and services, where platforms must send a Form 1099-K if you receive over $600 in a year, intended to capture gig economy/side hustle income, though delays and phased implementation have adjusted the timeline, with current rules for 2024 using a higher threshold ($5,000) before fully phasing to $600 for future years, but remember all taxable income, regardless of form, must always be reported.
The "3-year hobby rule," or IRS Hobby Loss Rule, is a tax guideline stating that if an activity makes a profit in three out of five consecutive years, the IRS presumes it's a legitimate business for tax purposes, not a hobby, allowing for business expense deductions; otherwise, it's presumed a hobby, and losses can't offset other income. The IRS examines factors like business-like operations, expertise, and time spent, but the profit test is a strong indicator, with exceptions for horse-related activities (2 of 7 years).
The Internal Revenue Code allows taxpayers to claim a capital loss deduction from their annual capital gains. Capital loss deductions from regular income are limited to $3,000 a year. Losses over this limit can be carried forward and claimed in future tax years if you make use of a capital loss carryover.
Tax loss harvesting is a fundamental idea that reduces the tax burden resulting from short-term and long-term investment profits. However, the strategy should only be used for tax planning and not be employed as a portfolio management tactic since its frequent use may amplify losses.
No, mortgage interest isn't always 100% deductible; it's subject to limits and conditions, primarily that the loan must be for buying, building, or improving your main or second home, and you must itemize deductions, with current limits at $750,000 of debt ($375k if married filing separately) for loans after December 15, 2017, while older loans have a $1 million limit, and you can only deduct the interest portion, not principal.
The First-Time Homebuyer Tax Credit is equal to 10 percent of the home's purchase price, capped at a maximum dollar amount set by law. In 2025, the maximum credit is $15,000 for most buyers, or $7,500 if you are married and file taxes separately.
Deductible house-related expenses