How this works
An electricity bill adds up three things: the fixed term (a daily charge just for having contracted power), the energy (the kWh you used × the price per kWh) and taxes on top (audiovisual contribution + VAT). VAT is the tricky bit: 6% only on the first 200 kWh and part of the fixed term, 23% on the rest. This calculator applies that rule correctly and lets you tune the prices to your plan.
- 1
Fixed term (contracted power)
You pay a daily amount just for having the meter connected, set by the power you contracted (in kVA). That daily price is multiplied by the days in the period.
- 2
Energy (kWh used)
The usage-dependent part: kWh used × price per kWh. This is where saving electricity actually shows up.
- 3
Taxes and levies
Add the audiovisual contribution (€2.85/month) and apply VAT: 6% on the first 200 kWh (300 for large families) and on the fixed term if power is ≤ 3.45 kVA; 23% on the rest.
Frequently asked
Why aren’t the prices fixed in this calculator?
Because there is no single price. On the open market each supplier and plan has its own energy price (€/kWh) and fixed term (€/day). That is why the fields are editable: copy the exact values from your bill or an offer and the estimate becomes realistic. The pre-filled numbers are only indicative for June 2026.
How does the reduced 6% VAT on electricity work?
Since 1 January 2025, the 6% rate applies to the first 200 kWh per 30-day period (300 kWh for large families), provided contracted power is up to 6.9 kVA. The fixed network-tariff term gets 6% if power is up to 3.45 kVA. Anything above those limits is taxed at 23%. The rules are the same in the regulated and open markets. (Azores and Madeira have their own rates.)
What contracted power should I have?
Power (kVA) sets how many appliances you can run at once without tripping the box, and how much fixed term you pay. The most common at home are 3.45, 4.6 and 6.9 kVA. Paying for too much power is wasted money; if the breaker trips often you may need more. Note only ≤ 3.45 kVA gets 6% VAT on the fixed term.
How many kWh does a home use per month?
As a rough reference: 1 person is around 120–180 kWh/month, a couple 180–250, a family of 3–4 about 250–400. It varies a lot with electric heating, AC, water heater and an EV. The real number is on your bill — use that.
Will this estimate match exactly what I pay?
Not exactly. The real bill may have two- or three-period rates, your campaign discounts, reading adjustments, minimums, the DGEG levy and supplier rounding. This tool gives you the right order of magnitude with the correct structure — to compare plans and understand the bill.
DISCLAIMER
An indicative estimate, not a bill. The pre-filled prices are open-market averages for June 2026 and change by supplier, plan and period — always check your own bill or offer. The tool assumes mainland Portugal and a flat rate (no two/three-period tariff); it excludes campaign discounts, minimums, adjustments and the DGEG levy. VAT rules follow Law 38/2024 (ERSE publishes the explainer). Azores and Madeira have different VAT rates. Not advice.