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If you have a rental property or side consulting gig, you're likely leaving money on the table every year. Not because you're doing anything wrong — but because you're not tracking the right expenses.
Most people know the obvious deductions (mortgage interest, business travel), but the real tax savings come from the dozens of smaller, often-overlooked expenses that add up to serious money. Let's walk through what you should actually be tracking for both rental properties (Schedule E) and self-employment income (Schedule C).
Mortgage interest and property taxes: Yes, these are deductible. But here's what most people miss — you can only deduct the portion that relates to rental use. If you're renting out part of your home, you need to calculate the percentage properly.
Insurance premiums: Not just your landlord policy, but also umbrella insurance that covers the rental property. Track these monthly, not just at renewal.
Property management fees: Whether you use a management company or pay someone to handle maintenance coordination, those fees are fully deductible.
Travel to and from your rental property:
Real-world miss: You drive to your rental property 24 times a year for inspections, maintenance coordination, and tenant meetings. That's potentially 500+ miles. At 70 cents per mile, that's $335+ you're not deducting.
Home office deduction for rental management: If you have a dedicated space where you manage your rental business (reviewing applications, handling bookkeeping, coordinating repairs), you can take a home office deduction. This is separate from the rental property itself. Additional rules may apply.
Calculation: If your home office is 150 sq ft and your home is 2,000 sq ft, that's 7.5% of your home expenses (utilities, insurance, HOA fees) that become deductible.
Professional services beyond your accountant:
Repairs vs improvements (this is crucial): Repairs are immediately deductible. Improvements must be depreciated over time. Here’s the difference:
Repairs (deduct now):
Improvements (depreciate over time):
The gray area: Replacing a roof. If it's a repair to fix leaks, potentially deductible now. If you're upgrading to a better roof system, it's an improvement. Document your reasoning.
Utilities you're paying during vacancy periods:
Advertising and tenant acquisition costs:
The hidden deduction: Cleaning and maintenance supplies: Most landlords buy supplies throughout the year and forget to track them:
Pro tip: Keep a dedicated credit card for rental expenses. Makes tracking infinitely easier at tax time.
Section 199A deduction for rental real estate: Starting in 2018, rental real estate can qualify for the 20% qualified business income deduction if you meet certain requirements (generally 250+ hours of rental services per year). This is huge if you qualify.
Casualty and theft losses: If your property is damaged by a federally declared disaster, or if you experience theft, these losses may be deductible (though the rules got stricter after 2017).
Depreciation acceleration: Beyond standard 27.5-year depreciation, you might be able to use cost segregation to accelerate depreciation on certain property components. For higher-value properties, this can create significant current-year deductions.
Yes, the short-term rental loophole is an incredibly hot rental strategy - but it deserves its own article, which we’ll publish separately!
Everyone knows about deducting software subscriptions and client dinners. But here's where the real savings hide:
Two methods:
What counts as home expenses:
Real numbers: If your home office is 200 sq ft in a 2,000 sq ft home (10%), and your annual home expenses are $30,000, that's a $3,000 deduction vs the $1,000 simplified method. Track actual expenses.
Requirements: The space must be used regularly and exclusively for business. "Exclusive use" means nothing else happens in that space — no guest bedroom that doubles as an office.
Two methods:
What business miles include:
What doesn't count: Regular commuting from home to a regular workplace.
The tracking problem: Most people lose thousands because they don't track miles throughout the year. Use an app (MileIQ, Everlance) or keep a mileage log.
Real-world scenario: You drive 3,000 business miles per year. That's over $2,000 in deductions you're missing if you're not tracking.
What's deductible:
What's not deductible:
Documentation needed:
Pro tip: Take a photo of the receipt and immediately add a note on your phone about who/why. Makes year-end categorization much easier.
Immediately deductible (Section 179 depreciation, or de minimis safe harbor):
The de minimis safe harbor: Items under $2,500 can be immediately expensed rather than depreciated. Make sure your accountant elects this.
Deductible:
Not deductible:
The gray area: MBA programs. Generally not deductible as they qualify you for a new trade, but there are exceptions if it's directly related to improving your current business.
Small stuff that adds up:
Digital subscriptions:
All deductible:
Business-related insurance:
The health insurance deduction: This is actually an above-the-line deduction on Form 1040, not a Schedule C deduction, but it's huge for self-employed people. You can deduct 100% of health insurance premiums for yourself, spouse, and dependents.
Often forgotten:
The big one: Self-employed retirement plan contributions (SEP-IRA, Solo 401(k)) are deductible and can be massive. For 2025, you can contribute up to $70,000 to a Solo 401(k) (or 25% of net self-employment income for SEP-IRA).
Why this matters: Not only do you get the deduction, but you're building retirement savings. This is often the single biggest deduction for profitable self-employed individuals.
Here's the reality: You won't remember expenses from January when you're doing taxes in April. You need a system that runs on autopilot.
1. Separate bank accounts and credit cards
2. Accounting software (even basic)
3. Receipt capture system
Spend 30 minutes once per month:
Why monthly matters: You'll remember the business purpose of that March dinner meeting in April. You won't remember it in December.
1. Round numbers everywhere If every expense is $100, $50, or $75, the IRS notices. Actual expenses are messy — $47.23, $112.87, etc.
2. Deducting 100% business use of vehicles Unless you have a dedicated business vehicle and another personal vehicle, 100% business use is basically never accurate. Be realistic — 60-80% is more defensible.
3. Excessive meals and entertainment If your meals and entertainment exceed your revenue, you're likely getting audited. Be reasonable.
4. Home office for W-2 employees If you're a W-2 employee with a side business, you can take home office for the side business. But you cannot take home office for your W-2 job (that deduction went away in 2018).
5. No documentation "I definitely spent this" doesn't work with the IRS without receipts and documentation. Keep records for at least 3 years (7 years for depreciation).
The difference between someone who tracks expenses properly and someone who doesn't can easily be $5,000-15,000 in deductions annually. That's real money — $1,500 to $5,000+ in actual tax savings depending on your bracket.
The secret isn't finding exotic deductions. It's thoroughly tracking the ordinary ones that happen dozens of times throughout the year.
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Wondering if you're maximizing your Schedule E and Schedule C deductions? Tax planning is most effective when it's proactive, not retroactive. Fifteenth can review your specific situation and help you implement a tracking system that captures everything you're entitled to deduct.
