Household cash
Give every pound a job before the month names one for you
A second income disappears in the same current account as the weekly shop. This page is the unglamorous half of the project: pots, dates, and the argument you should have before the money arrives.
Five pots, one page
You do not need five bank accounts on day one. You need five lines on a sheet that you update on the same day each month. Separate accounts help when the amounts get large enough to mix up. Start with the lines.
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Bills
Rent or mortgage, council tax, energy, water, transport, insurance, childcare, minimum debt payments. This pot is filled first from the main wage. A side income should not be required for these if you can possibly help it. If it is required, you do not have a second stream yet. You have a shortfall with extra steps.
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Buffer
Cash you can reach without selling something or asking a lender. A common aim is a few months of the bills pot. The exact month-count is your household’s, not a slogan from a video. Until a modest buffer exists, extra income has a job already: fill this, slowly.
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Tax
If the new stream is not fully taxed at source, move a slice aside on the day you are paid. A rough habit many sole traders use is to park a quarter to a third until they know their real rate, then correct it. It will be wrong at first. Wrong and saved is better than precise and spent. Dividends, lodger income above a scheme, and profits all have different sums. The tax notes are the map, not a calculator for your return.
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Future
Pension, ISA, or a boring savings account for a named goal more than a year away. Only money that is not needed for bills, buffer, or tax belongs here. An ISA allowance is a ceiling, not a target you must hit by borrowing.
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Spending
The pot you are allowed to enjoy without a meeting. If this line is zero forever, the second stream will be resented and then dropped. Name a small amount on purpose.
Joint and sole
A lodger in a shared home is not “your” project if the other person lives with the noise. A sole trade is legally yours even if the household spends the money. Write down who is allowed to move each pot. If you are not married or in a civil partnership, “we” is not a tax status. Keep records in the name of the person who earned the income.
Marriage Allowance can matter for some basic-rate couples. It is a real election with conditions, not an automatic boost. Check it on GOV.UK rather than assuming the household should use it.
When not to add a stream
If the bills pot is already short because of high-interest debt, a second stream can help, but only after the interest is visible. Sending new income into a new project while a costly balance rolls is how people stay busy and stay behind.
If you are ill, caring full tilt, or sleeping in the hours the plan needs, the honest note is to wait. A journal that tells exhausted people to “just start” is selling a feeling. We would rather you keep the job steady and the buffer growing by £20.
Then learn what the tax pot is for
The next page is the 2026/27 picture: allowances, Self Assessment, and the changes already in force this year.
Open the tax notes