Split 60/40: Rent and Bills Math, Line by Line

When you split 60/40, one person pays 60% of a shared cost and the other pays 40%. On $1,000 rent, that is $600 and $400.

The harder part is deciding who pays the 60 and checking that the number is fair. Below is one rent figure worked through line by line, then the same math on a utility bill, then a look at when 60/40 beats 50/50.

Worked example: $2,000 rent, $3,600 and $2,400 take-home

Say two people share a $2,000 apartment. Alex brings home $3,600 a month after tax. Sam brings home $2,400. Utilities (electric, internet, water) run $180 a month.

Step 1: turn income into percentages. Add the two paychecks, then divide each one by the total.

• Combined take-home: $3,600 + $2,400 = $6,000
• Alex: $3,600 ÷ $6,000 = 0.60, so 60%
• Sam: $2,400 ÷ $6,000 = 0.40, so 40%

Step 2: apply the percentages to rent. The formula is Share = Total × Percentage ÷ 100. The two percentages have to add up to exactly 100.

• Alex: $2,000 × 60 ÷ 100 = $1,200
• Sam: $2,000 × 40 ÷ 100 = $800

Step 3: apply the same percentages to utilities.

• Alex: $180 × 60 ÷ 100 = $108
• Sam: $180 × 40 ÷ 100 = $72

Step 4: add it up.

	Alex	Sam	Total
Take-home pay	$3,600	$2,400	$6,000
Share of income	60%	40%	100%
Rent	$1,200	$800	$2,000
Utilities	$108	$72	$180
Monthly total	$1,308	$872	$2,180

The same percentages work for the water bill, the gas bill and the internet. Set them once, and every shared bill uses them.

How to split 60/40 from your paychecks

Start with the paychecks. The ratio comes out of the division, and it lands on 60/40 only when the incomes happen to be 3 to 2.

Use take-home pay (after tax) for both people. Gross pay overstates what each person can spend. If you borrow a ratio from an article or a calculator, check which one it used. One roommate guide, for example, shows a 70/30 split built on gross incomes of $7,000 and $3,000. Whichever you choose, use the same kind of number for both people and say so out loud.

Real ratios are rarely round. Incomes of $5,000 and $3,000 give 62.5/37.5, so a $2,200 rent splits into $1,375 and $825. Incomes of $3,500 and £2,500 work out near 58/42, which turns a £1,200 rent into roughly £700 and £500. Expect numbers like 63/37 or 71/29. You can use them as they are, or round to 60/40 if you both agree.

A few more reference points:

• On $2,500 of monthly shared costs, 60/40 is $1,500 and $1,000. A 70/30 split is $1,750 and $750.
• With take-home of $4,500 and $3,000 (a $7,500 total), $3,000 of shared costs splits into $1,800 and $1,200.

60/40 versus 50/50: what changes in dollars

Back to Alex and Sam, and the full $2,180 a month.

Split	Alex pays	Sam pays	Alex, % of take-home	Sam, % of take-home
50/50	$1,090	$1,090	30.3%	45.4%
60/40	$1,308	$872	36.3%	36.3%

Under 50/50, Sam hands over almost 45 cents of every take-home dollar to shared costs. Alex hands over 30. Under 60/40, both put in the same 36.3%. That is the whole case for an income-based split. Sam keeps $218 more a month, and Alex pays $218 more.

The larger example works the same way. With take-home of $4,500 and $3,000 and $3,000 of shared costs, a 50/50 split costs each person $1,500. That is 33% of the first person's pay and 50% of the second's. At 60/40 it is $1,800 and $1,200, which is 40% of each paycheck.

If you want the longer comparison, Bills 50/50: When Splitting Evenly Is Fair covers when the even split is the right call.

When 60/40 is fair

Fair is a judgment call. A 60/40 income split can feel right to one couple and uncomfortable to another. Some couples cap the higher earner's share at 65%. Others never go past 50/50 on anything.

Some situations where 60/40 tends to make sense:

• Incomes differ. When one person earns clearly more, an even split can feel unfair to the lower earner.
• One room is better. A larger bedroom or a private bathroom can justify a bigger share. One roommate guide suggests a flat 5% to 10% premium for a clearly better room.
• A couple shares one room. Count the couple as roughly 1.5 shares rather than 2 or 1.
• Room size drives it. If you split by square footage, a 120 sq ft room in a 400 sq ft layout carries 30% of a $2,100 apartment, which is $630.

For more on income-based splits, see How to Divide Bills Based on Income.

What the percentages leave out

A percentage split uses whatever income numbers you enter. It knows nothing about who owns what. It doesn't account for equity, ownership stakes or legal obligations, so a couple buying a home needs a different conversation.

Agree on the grey areas up front, too. Dining out and vacations aren't clearly shared costs. Decide whether they go through the 60/40 or stay with whoever wanted them.

Then decide when to revisit the numbers:

• Check in after the first few months to see whether the split still feels right.
• Review it every quarter or whenever either income changes. Some couples do it once a year.
• If one income is irregular, use a twelve-month average rather than last month's paycheck.

If you front the rent

Most households have one person who pays the landlord and the utility companies. That person is out $2,180 before anyone else sends a dollar.

One approach is for that partner to cover the bills, keep the receipts and collect the other person's share at month end. In our example, Alex pays everything and Sam owes $872. If Sam fronted instead, Alex would owe $1,308.

With roommates, write down in the agreement who collects payments and who makes the final payment to the landlord. Also know the risk. On a single lease, a renter may be responsible for the entire rent if the roommates don't pay their portions.

Getting paid back is the awkward part. Divvy bill splitting is an iPhone app where groups keep a running balance of who owes whom across many receipts. Each person's share becomes a Venmo or Cash App request in one tap, with reminders until it's paid, so you aren't the one nagging. Your roommates don't need the app or an account. They open a share link, see what they owe, and pay. Divvy is free to download. For wording that works on a slow payer, see How to Ask Someone to Pay You Back.

Run your own numbers

Open the rent split calculator, pick the by-income option, and enter your rent and each person's take-home pay. It does the division, and you can compare the result against an even split or a split by room size. Then run the same percentages on your utilities.