The mistake most people make
When a provider raises the electricity or gas price, the tempting move is to open the tariff and overwrite the old number. Don't. If you edit the price in place, every past bill that used the old rate gets silently recalculated with the new one — and your history stops matching what you actually paid.
Add a new tariff, dated
Instead, keep the old tariff as-is and add the new price with the date it took effect. FinMan stores tariffs on a timeline, so it knows which rate applies to which period. Readings taken before the change are billed at the old price; readings after it use the new one.
You can do this straight from the bot's Utilities menu — no web app needed. Open the address, pick the service, and add a tariff or edit an existing one's name, type and price. Tenants keep read-only access, so they see the change without being able to alter it.
Tip: take a meter reading close to the switch date. It splits the month cleanly into an old-price chunk and a new-price chunk, so each part is billed at the right rate.
Multi-tariff meters still work
If you're on a day/night meter, the same rule applies per tariff. Change happened only to the night rate? Add a new night price dated from the switch; the day price stays untouched. Each tariff type carries its own timeline.
Metered, subscription or manual
Tariff type matters as much as price:
- Metered — bill computed from the reading difference times the price.
- Subscription — a fixed monthly amount, regardless of usage.
- Manual — you enter the billed amount yourself.
If a provider moves you from a flat subscription to metered billing, add the new metered tariff dated from the change rather than converting the old one. That way the earlier months stay recorded as the fixed fee you actually paid.
Quick checklist
- Log a reading near the change date.
- Add the new tariff with the correct effective date — don't overwrite the old one.
- Confirm the type (metered / subscription / manual) matches the new arrangement.
- Enter your next reading as usual; FinMan applies the right price to each period automatically.
Handled this way, a price hike is just two dated entries — and your bill history stays honest, month after month.