New Housemate Shared Bills Checklist

A new housemate changes who uses household services, contributes to each bill and needs enough information to spot a mistake.

The easiest time to make those decisions is before the first payment is due. A short written setup prevents the new person from inheriting old assumptions and stops the existing household from quietly using a split that no longer fits.

This checklist covers the practical money side of a move-in: the start date, shared costs, the split, a partial month and a record everyone can check.

Start with contracts, not arithmetic

First establish which agreements actually apply to the new housemate. A private household split cannot change a tenancy, supplier contract or legal responsibility.

Check:

whose names are on the tenancy or ownership documents;
whether rent includes any utilities or services;
who is named on each separate household account;
whether the landlord, agent or supplier must approve a change; and
the exact date the new person becomes responsible for costs.

For households in the UK, MoneyHelper explains that tenancy wording affects responsibility and that at least one person must be the named payer for each separate account. It also notes that the named payer remains responsible for paying on time if another housemate has not contributed (MoneyHelper on renting with housemates). Rules and contracts differ by country and provider, so confirm the position that applies to your home rather than copying another household's arrangement.

Write down the result plainly. For example: “Noor is named on the broadband account; all three housemates share the cost from 16 July; Noor pays the provider.” This separates provider responsibility from the household's internal contribution rule.

Build one register of shared bills

Next, make a complete list before discussing percentages. Use recent bills and statements rather than memory. MoneyHelper's Budget Planner guidance recommends having payslips, bank statements, bills and a banking app to hand so budget figures are realistic (MoneyHelper Budget Planner).

For each cost, record:

provider and service;
typical amount and how often it is charged;
due date;
named payer;
payment account or method, without recording passwords or full payment details;
whether the cost is shared, personal or included in rent; and
the date the new split begins.

Include less frequent costs such as annual insurance or quarterly service charges. Convert them to a monthly planning amount if the household saves throughout the year, but retain the due date.

Do not include transfers between housemates as extra expenses. If one person pays a €90 internet bill and the others transfer their shares, the household cost is still €90. The transfers only explain how the bill was funded.

Capture a clean move-in boundary

Variable services need a clear handover point. Record meter readings or other available usage evidence on the move-in date, and keep the date with the evidence. This helps separate consumption before and after the new housemate joined.

Citizens Advice's England guidance tells people moving home to read energy meters on moving day, give the reading to the supplier and retain the reading and date in case a bill is disputed (Citizens Advice on moving home and energy). Even where that exact guidance does not govern your home, a dated handover reading is a useful factual boundary. Check your local regulator and supplier instructions.

Also record any opening balance in the household's shared pot. A balance built before the move-in date does not automatically belong equally to the new person. Decide whether it remains with existing members, is refunded or is carried forward by agreement.

Agree the split before the first due date

There are three common starting points:

Even: everyone pays the same share.
Income-based: contributions follow each person's share of agreed household income.
Custom: the household uses chosen percentages, perhaps because rooms, occupancy or included services differ.

None is automatically fair. Choose the rule together, state which costs it covers and make sure percentages total 100%. If incomes differ, this guide to equal, income-based and custom household bill splits provides worked comparisons.

Keep personal costs outside the shared pool. A housemate's individual streaming plan or private phone contract should not become shared merely because it appears on the same payment card as a household service.

Agree an exception process too. If a guest stays for several weeks, someone works away or a bill contains a clearly personal add-on, decide who raises it and when. The default split should reduce routine debate, not prevent reasonable corrections.

Choose a partial-month rule explicitly

A mid-month arrival creates a one-off question: should the new housemate pay a full share, a daily share or only measured usage?

The answer may differ by cost:

rent should follow the tenancy or written occupancy agreement;
metered services can use a handover reading where available;
fixed services can use an agreed daily calculation; and
costs paid before the move-in date may remain with the previous household.

Suppose July's agreed shared pool is €1,860 and three people will normally split it evenly. A full monthly share is €620. The new housemate joins on 16 July and is present for 16 of the month's 31 days.

Using a daily proportion for the newcomer's first share:

€620 × 16 ÷ 31 = €320

That leaves €1,540 for the two existing housemates, or €770 each. The three contributions still add up to €1,860.

This is a convention, not a universal rule. It may be unsuitable for rent governed by a contract or a cost that does not vary with occupancy. Record the method and dates. If division creates a fraction of a cent, agree who takes the rounding adjustment while keeping the total unchanged.

Decide how money will reach each provider

For every bill, identify one operational owner even when several people are named on the account. That person checks the amount, confirms the due date and tells the household about changes. Operational ownership does not mean they should carry everyone else's share.

Choose a contribution date early enough for the named payer to act. If the energy payment leaves on the 20th, transfers arriving that day may be too late. Allow for weekends and bank processing.

Then choose one accounting method:

Everyone contributes to a shared pot, and bills are paid from it; or
named payers pay providers, and the household records reimbursements between members.

Either can work. Mixing them without clear labels leads to double-counting. A transfer into the shared pot and the later provider payment are not two household expenses.

Give access without sharing credentials

The new housemate needs visibility, but not necessarily every supplier password or unrestricted access to another person's account.

Share the bill register, relevant statements and household rules. Use separate user access or provider-authorised contacts where available. Do not send passwords through a group chat or reuse one password across services. Keep unrelated transactions and identity documents out of the shared record.

Be equally clear about who can change the split, add a cost or mark a bill as handled. A useful record needs both transparency and boundaries.

Add the member to Billum after the rule is agreed

Billum can hold the working household record once the people have agreed what it should represent.

An existing household member can open My Household, enter the new housemate's email address and send an invitation. The invited person is added to the household member list after they accept and their membership has been synchronised. The household can then save an even, income-based or custom percentage split; income entries are available when the household chooses an income-based method.

Billum does not automatically apply a membership start date or prorate a mid-month move-in. Adding a member or changing the household split can affect how earlier shared months are calculated, so keep the first-month proration in a separate note and recheck historical month totals after changing the household. Use the appropriate start month for new agreements and date individual bills accurately.

Billum records members, bills, split settings, paid or unpaid payment states, and settlement records. It does not alter supplier contracts, decide what is fair, move money or read bank accounts. The household still needs to make payments through its chosen providers and accounts.

Hold a short first-month review

Set a date after the first full billing cycle. Ten minutes is usually enough if the register is complete.

Check:

Did every expected bill arrive?
Did the partial-month calculation match the agreed dates and evidence?
Did contributions arrive before provider payments were due?
Were any personal items included by mistake?
Do the normal split and payment dates still feel workable?

Correct the record while statements and move-in evidence are easy to find. If the arrangement needs to change, choose a clear effective month instead of editing past figures without explanation.

Keep the setup checklist for future changes. When someone eventually leaves, the reverse process matters just as much; use the housemate moving-out bill checklist to close accounts and split responsibilities cleanly.

Make the first month boring

A good shared-bill setup should feel uneventful. Everyone knows which costs are shared, who is named on each account, how the first partial month works and when money must move.

Start with contracts, build one bill register, capture dated handover evidence and agree the split before asking for contributions. Then record the decision in a system the household can inspect.

That small amount of work turns a new housemate from an accounting surprise into a planned change.