Mr.Splitter

Roommate Expenses: Rent, Utilities and Internet, Settled Monthly

Flatshares rarely argue about totals — they argue because each line follows a different rule. Rent goes by room size, electricity by head, internet split evenly, and it all repeats every month. Mr.Splitter lets each expense carry its own split — even, or amounts you set and lock — settles who owes whom at month end, and keeps the record in the group so nothing is lost when a roommate moves out.

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What a flatshare actually needs

One household, different rules

Work out each person's rent from room size, enter those amounts and lock them (say NT$12,000 / 10,500 / 7,500), and split utilities and internet evenly. Each expense can use a different approach.

Recurring monthly bills

Rent, internet, and other fixed monthly lines are set once and keep recording, so nobody re-enters them every month.

See who fronted and who has not paid

One person usually wires the rent while another pays the utility bill. The actual payer is recorded, and month end shows each person's net position without scrolling the chat.

Settle once a month

Everything nets out into the fewest transfers. Three roommates usually close the month in two payments rather than paying each other in circles.

Export as the shared record

Monthly expenses, each share, and the settlement export to Excel — useful when checking meter readings against the landlord's bill.

Survives roommate turnover

When someone moves out and someone moves in, change the members. Past records stay, and the new roommate only shares expenses dated after they joined.

Compared with keeping track in the group chat

Most flatshares start by just saying it in the chat. That holds while there are two or three lines, then stops working.

ItemMr.SplitterGroup chat
Different rules per line
Split evenly, or adjust and lock individual amounts
Relies on memory and verbal agreement
Recurring bills
Set once, keeps recording
Repeated by hand every month
Who has not paid
Net position is visible
Scroll back through messages
Month-end settlement
Minimum transfers computed
Added up by hand, lines get missed
Durable record
Kept in the group, exportable to Excel
Lost once the chat scrolls
Cost
Free: 30 groups, 20 members each. Pro NT$40/month
Free

※ This table compares the common chat-and-memory habit with Mr.Splitter, not any specific commercial product.

A worked example: three roommates, one month

Rent by room size

Rent is NT$30,000, agreed by room size as NT$12,000, NT$10,500, and NT$7,500 (40% / 35% / 25%). Enter and lock those three amounts on the expense. Xiang, who has the main bedroom, wires the full amount to the landlord.

Utilities split evenly

This month: electricity NT$2,400, water NT$600, internet NT$900 — NT$3,900 in total, or NT$1,300 each. Jie pays all three bills.

Month end: two transfers

Owed: Xiang 13,300, Jie 11,800, You 8,800 (33,900 total). Paid: Xiang 30,000 (net +16,700), Jie 3,900 (net −7,900), You nothing (net −8,800). Result: Jie sends Xiang 7,900 and You sends Xiang 8,800.

Roommate splitting FAQ

How should rent ratios be decided without an argument?+
Three common approaches: convert actual room floor area into percentages; start from an even split and add or subtract a fixed amount for an en-suite, a window, or a balcony; or simply negotiate a number everyone accepts and attach it to the lease. Whichever you pick, agree before move-in and write it down. Saving the agreed amounts as a recurring monthly expense carries them forward each month instead of being renegotiated.
Should electricity be per person or by usage?+
Most shared flats split evenly per person, because sub-metering each room is expensive. If someone works from home full time or has their own air conditioner, consider splitting a base allowance evenly and charging usage above it to that person, or adding a fixed surcharge for that room. What matters is agreeing the rule up front rather than arguing after the bill lands.
A roommate is away for half the month. Can they pay less?+
Yes — either exclude them from the specific expenses, or lower their amount and lock it so the rest redistributes. It is worth agreeing in advance how long an absence has to be before it changes anything, otherwise it becomes a monthly negotiation.
How do we record the deposit or a one-off repair?+
Record it as a normal expense with the appropriate split. A deposit usually comes back at the end of the tenancy, so log the refund as income in the month it arrives and the final settlement returns it to whoever fronted it.
What if a roommate will not install an app or sign in?+
Nothing needs installing — signing in with LINE or Google runs it in the browser. If someone will not sign in at all, add them as an unregistered member and record on their behalf; they still appear in the settlement and you can send them the result.
Is the free tier enough for a flatshare?+
Yes. A typical flatshare is two to six people in one group. The free tier covers joining 30 groups, creating 10, and up to 20 members per group, with no limit on expenses. Pro at NT$40/month is for unlimited groups, 50 members per group, 50 AI entries per month, and no ads.

Related pages

HomeRoommate splitting guideBudget management guideAI receipt scanningAll features

Stop tracking it in the chat

Create the household group, set the rent and utility rules once, and let month end work itself out.

Create a household group