Free guide
Household budget, step by step
A family budget is not about cutting everything. It is about knowing where your money goes — and having something left at the end of the month. This guide walks you through building one in a single evening, including the 50/30/20 rule and a calculator.
Five steps to a budget that works
1. Add up your net monthly income
Count what actually lands in your account, after tax and contributions. If your income is irregular, take the average of the last six months and round it down.
2. List your fixed costs
Rent or mortgage, utilities, internet, phone, insurance, loan payments, childcare. These arrive every month no matter what. Use three months of bank statements, not memory.
3. Map the variable spending
Groceries, transport, household goods, restaurants, clothes, subscriptions. This is where budgets usually break, because people underestimate it. Three months back gives you a realistic number.
4. Split income with the 50/30/20 rule
50% needs, 30% wants, 20% savings and debt. If it does not add up, the rule is not wrong — it is telling you which category is out of line.
5. Track it and adjust after a month
A budget you never check is just a wish list. Log expenses as they happen and compare plan against reality at month end. The first two months will be off — that is normal.
The 50/30/20 rule in practice
The 50/30/20 rule splits net income into three buckets. It is popular because it needs no dozens of categories — you only decide which bucket an expense belongs to.
50/30/20 calculator
Enter your net monthly income and see what each category should be.
Needs (50%)
$600.00
Housing, utilities, groceries, commuting, health, mandatory insurance, minimum loan payments.
Wants (30%)
$360.00
Restaurants, holidays, subscriptions, hobbies, clothing beyond the basics, electronics.
Savings and debt (20%)
$240.00
Emergency fund, investments, retirement, extra loan repayments above the minimum.
How big your emergency fund should be
The common guidance is three to six months of essential spending. Three is enough with stable employment; aim for six if you are self-employed or the household has a single income. Keep it separate from your current account so you do not spend it without noticing.
With your needs at $600.00, that means: $1,800.00 – $3,600.00
Categories for your budget table
| Category | Bucket | How often |
|---|---|---|
| Rent / mortgage | Needs | Monthly |
| Utilities and water | Needs | Monthly |
| Groceries | Needs | Weekly |
| Transport and fuel | Needs | Monthly |
| Insurance | Needs | Monthly / yearly |
| Restaurants and cafés | Wants | Ongoing |
| Subscriptions and fun | Wants | Monthly |
| Holidays | Wants | Yearly |
| Emergency fund | Savings | Monthly |
| Investments | Savings | Monthly |
Frequently asked questions
How do I build a household budget?
Add up your net monthly income, list fixed costs, map variable spending from the last three months, split income with the 50/30/20 rule, and adjust after the first month based on reality.
What does the 50/30/20 rule mean?
50% of net income goes to needs (housing, food, transport), 30% to wants (fun, holidays) and 20% to savings and debt repayment above the minimum.
How big should an emergency fund be?
Three to six months of essential spending. Three is enough with stable employment; six suits self-employment or a single-income household.
Excel or an app for budgeting?
Excel works but you have to update and sum it by hand. An app logs an expense in seconds and recalculates categories and the 50/30/20 split for you, so the budget tends to survive longer.
Track your budget instead of an Excel sheet
TheFigiPlanner adds up income, expenses and the 50/30/20 split automatically — in euros or koruna, in Slovak, Czech and English. The basic version is free.