How to split rent and bills when moving in together

Which kind of move are you making?

There are two starting points, and each one needs different math.

• A. A new shared lease. You both sign for a new place, and the rent is a new cost for each of you.
• B. A partner joins your lease. You already pay the rent, it does not change, and the question is what the new person should add.

A: How do you split rent on a new shared lease?

Choose equal, by income or by room size, and use the same example numbers under each to see the gap. Say the rent is $2,400 for a two-bedroom. Partner 1 takes home $3,300 and has the 180 square foot bedroom. Partner 2 takes home $2,700 and has the 120 square foot one.

Method	Basis	Partner 1 pays	Partner 2 pays
Equal	50/50	$1,200	$1,200
By income	$3,300 ÷ $6,000 = 55%	$1,320	$1,080
By room size	180 ÷ 300 = 60%	$1,440	$960

The by-income row has a handy property. Each person pays 40% of their own take-home ($1,320 ÷ $3,300 and $1,080 ÷ $2,700). The room-size method ignores shared areas such as the kitchen and living room, so it matters most where the bedrooms differ a lot. For the full method, see how to split rent based on income and how to split rent by room size.

B: What if your partner joins your existing lease?

When the rent does not change, the choice is how much of it moves to the new person. Say the rent is $1,800 and your utilities were $140 a month. With two people they rise to $200.

• Split the whole rent equally. Your rent falls by $900, and your partner pays $900.
• Partner pays a chosen share plus the added costs. Your partner pays $600 of the rent and half of the $60 rise in utilities, which is $30.

Option	Partner pays	You pay
Split rent and utilities equally	$1,000	$1,000
$600 of rent plus half the utilities rise	$630	$1,370

Both rows add to $2,000, which is the $1,800 rent plus $200 of utilities. Groceries can be split equally in either case. Who is on the lease and who pays are separate questions. The lease says who the landlord deals with, and your split says who pays whom. If your partner is not on the lease, check what it says about extra occupants before you agree numbers, because that is a question for your landlord.

What do you do about one-off move-in costs?

Record each one as its own expense with its own rule. Keeping them out of the monthly rent makes it clear later what a number was for.

• Furniture and household items. Say one partner pays $1,200 for a sofa and a desk and you split it equally. The other partner owes $600. Agree who keeps what if you part.
• Internet set-up. A one-time fee is a separate expense, not part of the monthly bill.
• A refundable deposit. Keep it as its own line, so it can be dealt with separately when it comes back.
• Moving costs. Truck hire and cleaning are shared only if you both used them.

Why try it for 3 months, then re-check?

Estimates are guesses until real bills arrive. Write a date three months out on your calendar and compare what you assumed with what happened. Say utilities were estimated at $200 but averaged $230. The rise is now $90 instead of $60, so half of the rise is $45 instead of $30. Change the numbers if either of you feels the split is off, rather than waiting for it to build into a bigger problem.

How do you set this up in EvenOut?

EvenOut has a group type that fits.

1. Create the group. Under “New group”, choose “Household” (“Rent and bills”) and name it, for example “Apartment”. Add your partner from your friends, or use “Invite with a link”.
2. Add the rent. Tap “Add expense” and type the amount. Choose who paid. For an equal split, leave “Split equally”. For a fixed share like $600 and $1,200, choose “Exact amounts” and type each one. The pill reads “All assigned” when it adds up.
3. Repeat it monthly. Under “Photo, repeat, pending or note”, tap “Repeat” and choose “Monthly”. EvenOut adds each later one for you with the same payer and split, so it suits the rent share, not utilities that change. Setting it up needs a connection.
4. Log the one-offs. Add the sofa as an expense, and choose the “Furniture” category.
5. Settle up. Tap “Settle up” on the group page and record the transfer. EvenOut records payments only, so you send the money yourselves first.

What should you do next?

For a longer view of the couple’s setup, read how to split bills as a couple. If you are splitting the household by percent, the split bills based on income guide has the formula. If one of you owns the home, splitting bills with a partner when you own the house covers that case.