--- title: "A budget that survives a real month" description: "Split spending into fixed and variable costs, leave a buffer for unexpected costs, then track a month's spending and compare it with the plan. The difference between planned and actual amounts helps y" canonical: https://lightmysky.com/learn/life-skills/a-budget-that-survives-a-real-month-mt_tFRHTFelNG source: https://lightmysky.com/learn/life-skills/a-budget-that-survives-a-real-month-mt_tFRHTFelNG.md retrieved: 2026-11-12 --- > **Agent view.** This is the Markdown twin of the page, for tools and assistants. > When to use this site, and the call that answers each job: https://lightmysky.com/agent-instructions.md > API description (OpenAPI 3.1): https://lightmysky.com/openapi.json · Authentication: https://lightmysky.com/auth.md > Pricing: https://lightmysky.com/pricing.md · Catalog: https://lightmysky.com/llms.txt · Full catalog: https://lightmysky.com/llms-full.txt > Every machine-readable file on this domain: https://lightmysky.com/.well-known/ai-catalog.json > Ask for Markdown with `Accept: text/markdown`, a `.md` address, or `?mode=agent`. # A budget that survives a real month Split spending into fixed and variable costs, leave a buffer for unexpected costs, then track a month's spending and compare it with the plan. The difference between planned and actual amounts helps you learn from the month. Subject: Life Skills · Area: Money & Finance · Ages 14 to 15 Page: https://lightmysky.com/learn/life-skills/a-budget-that-survives-a-real-month-mt_tFRHTFelNG ## Ready when they can - Build a one-month budget that separates fixed commitments from variable spending and carries a buffer line - Track actual spending for a month, compare it with the plan and explain possible causes of differences - Use recorded differences and expected changes to revise next month's budget within available income ## Lesson: A monthly plan that teaches you You have planned saving toward a goal. A monthly budget also covers spending. Start with income you expect to have after deductions, such as tax. Fixed costs stay at the same amount over the planning period, though they can change later. Variable costs change with use, prices or choices. Food can be a variable cost and still be a need. **Example.** Leah has £180 available this month. She plans a fixed £20 phone payment, £40 for travel, £35 for food, £30 for fun, £35 for saving and a £20 buffer. These total £180. A buffer is money reserved for unexpected costs, not extra income. A surprise can exceed it. Spending, savings and buffer must fit available income; if their total is too high, revise the allocations. *(drawing: £20 + £40 + £35 + £30 + £35 + £20 = £180. Each pound is allocated once.)* Record each payment with its amount, date and category. Compare actual totals with the original plan. Actual minus planned is positive for spending above plan and negative for spending below it. For the size of the cash gap, subtract the smaller amount from the larger. Check the records for causes, such as a changed price or an unusual payment. **Example.** Percent means out of 100. Divide the gap by the positive planned amount to get a decimal, then multiply by 100. A £40 plan and £50 actual spending give a £10 gap: 10 ÷ 40 = 0.25 = 25 ÷ 100, so spending is 25% above plan. A decimal percentage such as 2.5% means 2.5 out of 100. For spending below plan, use the gap's size and say it is below. Name the planned amount as the reference. If the plan is £0, report the cash gap without dividing by zero. A percentage compares a gap with its planned amount. It does not decide what to pay or change first. Check the cash amount, payment dates, needs and cause of the gap too. A small percentage on a large bill can still involve needed money. A large percentage on optional spending does not make that spending urgent. Use records to revise next month's plan. A one-off taxi fare after a cancelled bus need not become a regular travel cost. Repeated higher food costs may need a new estimate. Check expected income and commitments too. If a required allocation rises while income stays the same, look for affordable reductions elsewhere. Add the revised spending, savings and buffer to check that the whole plan still fits. **Recap.** Plan costs, savings and a limited buffer. Record actual spending, explain differences and revise within available income. *This monthly-budget lesson, its questions and flashcards were written for this dataset.* ## Practice 8 questions on this page, each with its working shown. ## Needs first - [Financial planning](https://lightmysky.com/learn/life-skills/financial-planning-mt_r1hw-KenpK) ## Optional connections - [Spreadsheets: Rows, Columns and a Formula That Updates Itself](https://lightmysky.com/learn/computing/spreadsheets-rows-columns-and-a-formula-that-updates-itself-mt_iWyPF0-Abz) - [Budgeting Pocket Money](https://lightmysky.com/learn/life-skills/budgeting-pocket-money-mt_Qzbh-_v0Gq) ## Opens up - [Feeding Yourself on a Budget](https://lightmysky.com/learn/design-and-technology/feeding-yourself-on-a-budget-mt_C1XoXVJlgA) - [Insurance: Choosing Cover for Financial Risks](https://lightmysky.com/learn/life-skills/insurance-choosing-cover-for-financial-risks-mt_JrCLZCH881) - [Renting a Place and What It Really Costs](https://lightmysky.com/learn/life-skills/renting-a-place-and-what-it-really-costs-mt_jxyHZEprXc) - [What Comes Out of a First Payslip](https://lightmysky.com/learn/life-skills/what-comes-out-of-a-first-payslip-mt_L4Ygz5CNjP) - [Starting a Pension at Eighteen](https://lightmysky.com/learn/life-skills/starting-a-pension-at-eighteen-mt_mGfpMq2IAW) - [Credit Files and What Lenders See](https://lightmysky.com/learn/life-skills/credit-files-and-what-lenders-see-mt_SfwNy9cOjb) - [Paying for What Comes After School](https://lightmysky.com/learn/life-skills/paying-for-what-comes-after-school-mt_Zarsb85RH9)