Time-Space Percentage Calculator for Home Daycare
Your Time-Space percentage determines how much of your home expenses you can deduct as a business expense. Use this free calculator to find yours in under 60 seconds.
Step 1: Your home's total square footage
Not sure? Here's how to find it:
- • Zillow or Redfin — search your address, square footage is usually listed
- • Your lease or deed — check the paperwork from when you moved in
- • Property tax bill — your county lists it on the assessment
- • Cook County Assessor — search your address at cookcountyassessor.com
- • Measure it yourself — multiply length × width of each room and add them up
Step 2: Square footage used for daycare
Count every room the kids regularly use — kitchen, bathroom, living room, hallways, not just the playroom. If they eat there, play there, or wash hands there, it counts.
Step 3: How many hours per day is your home used for daycare?
Include prep time (setting up before kids arrive) and cleanup (after they leave). If kids are there 7am–5pm plus 30 min prep and 30 min cleanup, that's 11 hours/day.
Step 4: Weeks per year you operate
52 weeks minus any weeks you're fully closed (vacation, holidays). Most providers operate 48–50 weeks.
What Is the Time-Space Percentage?
The Time-Space percentage is an IRS-approved method (from Publication 587) that lets home daycare providers deduct a portion of their home expenses as business deductions. It combines two measurements:
- Space %— The percentage of your home's square footage that is regularly used for daycare. This includes every room the children use: playroom, kitchen, bathroom, hallways, living room.
- Time %— The percentage of total hours in a year that your home is used for daycare. A year has 8,760 hours. If you operate 55 hours per week for 50 weeks, that's 2,750 hours, or about 31.4% of the year.
The formula:
Space % × Time % = Time-Space %
Example: If 50% of your home is used for daycare, and it's used 31.4% of the year → 50% × 31.4% = 15.7% Time-Space percentage.
Which Expenses Use the Time-Space Percentage?
Your Time-Space percentage applies to shared home expenses — costs that are split between personal use and business use. These include:
Expenses that are 100% for your daycare (food, supplies, toys, training) are fully deductible — they don't use the Time-Space percentage. See the full list of home daycare tax deductions.
How to Maximize Your Time-Space Percentage
1. Count every room the kids use
Don't just count the playroom. If children eat in the kitchen, wash hands in the bathroom, play in the living room, or walk through the hallway — all of that square footage counts. Most providers undercount by 20-30%.
2. Include prep and cleanup time
Your “daycare hours” aren't just when kids are present. The IRS allows you to include time spent preparing for daycare (setting up activities, preparing meals) and cleaning up afterward. If kids arrive at 7am but you start prepping at 6:30am, and you clean until 6:30pm after they leave at 6pm — that's an extra hour per day.
3. Count exclusive-use areas at 100%
If any room is used exclusively and regularly for daycare (a dedicated playroom that your family never uses for personal purposes), those square feet can be deducted at 100% regardless of time. Talk to your accountant about this — it can significantly increase your deductions.
Real-World Examples
Small apartment daycare
850 sqft total, 500 sqft used for daycare, 50 hours/week, 50 weeks/year
Space: 58.8% × Time: 28.5% = 16.8% Time-Space
Typical home daycare
1,200 sqft total, 700 sqft used, 55 hours/week, 50 weeks/year
Space: 58.3% × Time: 31.4% = 18.3% Time-Space
Large home daycare
2,000 sqft total, 1,200 sqft used, 60 hours/week, 48 weeks/year
Space: 60.0% × Time: 32.9% = 19.7% Time-Space
Frequently Asked Questions
What is a “good” Time-Space percentage?
Most home daycare providers fall between 15% and 35%. There's no “right” number — it depends entirely on your home's size and how many hours you operate. A higher percentage means a bigger deduction on your shared home expenses.
Do I need to calculate this myself for my taxes?
Your accountant will calculate and apply the final percentage on your tax return. But knowing your approximate Time-Space percentage helps you understand how much of your home expenses will be deductible — and it's a number your accountant will ask for.
Where does the IRS define the Time-Space percentage?
IRS Publication 587, “Business Use of Your Home,” covers the rules for deducting home expenses. The Time-Space percentage method is specifically designed for home daycare providers who use their home for both personal and business purposes.
Can I use this calculator for my actual tax filing?
This calculator gives you a reliable estimate based on the IRS formula. For your actual tax return, your accountant may adjust it based on exclusive-use areas, part-year operation, or other factors specific to your situation.
Track your deductions automatically
DaycareProfit sorts every expense into the right deduction type — 100% business, Time-Space %, or mileage — so your accountant gets a clean, organized report at tax time.
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