Splitting utility bills fairly in a shared flat

Key rules

• Liability: Only the named holder is liable to the supplier, unless flatmates also signed the contract.
• Written agreement: Anyone who wants protection should be a co-holder or have a written agreement on shares.
• Cut-off risk: If the holder defaults, the supplier can cut supply for the whole flat.

Only the named holder answers to the supplier

The supplier deals only with the titular, the person named on the contract. If that person stops paying, the supplier can chase only them. Your flatmates owe the supplier nothing unless they signed the contract too.

The risk still reaches everyone. If the holder defaults, the supplier can cut the supply, and the flat goes without. Unpaid debts can also be recorded against the holder, for example in solvency files, which can make it harder for them to get credit later.

Protect the holder and the flatmates

Pick one of these:

• Make everyone a co-holder. Everyone is then named on the contract and shares the responsibility.
• Keep one holder and sign a written agreement. It should say who pays what share and by when.

If you are the holder, the written agreement matters most. Between flatmates, you can claim a share from the others under your agreement or lease. In practice that means a civil claim, which is slow and awkward. A clear record of what was agreed makes it far easier.

If you are not the holder, remember that you have no direct protection with the supplier. Your protection is the agreement and proof of your payments. Keep the transfers.

Choose how to split

Pick a method and put it in writing.

• Equal split of each bill. Simple. The holder shares the bill and everyone sends their part by bank transfer or Bizum. It can feel unfair if someone is often away or uses more.
• Shared-expense app. Apps such as Splitwise or Tricount record who paid and balance the accounts. They make everything visible.
• Fixed monthly contribution. Everyone pays the same amount into a shared account or kitty, and the bills are paid from it. You know your cost in advance. Check the balance every so often and top up or refund the difference. A joint account needs trust and some admin.
• Split by room size or by use. Use this if rooms differ a lot, someone is away for long periods, or one person uses air conditioning much more.

What to put in the agreement

A short message everyone confirms is enough. Include:

• who the holder is for each service
• the method you chose
• the date each month when payments are due
• what happens if someone is away or moves out
• how a late payment is handled

Agree it before the first bill arrives. The questions below cover common worries.

Frequently asked questions

Can the supplier chase my flatmates if the holder stops paying?

No, the supplier can only claim the unpaid bills from the named holder, unless your flatmates also signed the contract. If the holder defaults, the supplier can cut the supply for everyone, and the debt can be recorded against the holder in credit files. Anyone who wants protection should become a co-holder or have a written agreement on shares.

Can the holder claim money back from flatmates who do not pay their share?

Yes, the holder can claim a share from flatmates under a written agreement or the lease, and in practice by a civil claim. Without anything in writing, the claim is harder to prove. Put each person's share in writing before the first bill arrives.

Is an equal split the fairest way to share utility bills?

An equal split is the simplest method, but it can feel unfair if someone is often away or uses air conditioning more. In that case, split by room size or by use instead. Whatever you choose, write it down so nobody argues later.

How can we split bills without chasing each other every month?

A fixed monthly contribution into a shared account gives predictable payments, but you need to adjust it now and then to match real bills. A shared-expense app such as Splitwise or Tricount tracks who paid and balances the accounts.