Sources
- CSGB / Asgari Ücret Tespit Komisyonu (2026 brüt/net)
- GİB gelir vergisi tarifesi 2026
- EPDK mesken elektrik kademeli tarife (yaklaşık)
- BOTAŞ / dağıtım şirketleri doğalgaz (yaklaşık)
- Hazine ve Maliye — kıdem tazminatı tavanı 1. dönem 2026
Inflation Calculation
Price change, purchasing-power loss and real salary are different views of the same maths. One item is not an official basket.
Price-change formula
(New − old) / old × 100. A rise from 100 to 150 is 50%. Official CPI uses weighted baskets; a single bill line is not national inflation.
Base effects can make an annual rate look “low” while the price level remains high. Separate the level of prices from the speed of change when you read headlines.
Inverse purchasing power
A 50% price rise cuts purchasable quantity by about 33.3% (1/1.5). It does not automatically halve purchasing power.
Real salary
Compare pay changes and inflation over the same dates. The inflation-salary tool is arithmetic, not a forecast.
Gross raises and net raises diverge when tax brackets shift. Prefer net pay in inflation-salary comparisons. Smooth irregular bonuses into a yearly average.
Compounding across years
Two successive 20% years compound to about 44%, not 40%. Multiply factors instead of adding headline rates.
Rent-cap indexes and CPI references are not always the same number in a lease. Read the clause. For savings goals, grow the future price with compounding scenarios.
Personal versus official baskets
Your spending mix can diverge from the average CPI basket. Track a personal proxy for budgeting, not as official statistics.
Renters, drivers and transit users experience different personal inflation. Weight rent, food, energy and transport for a budget early-warning index—not as a substitute for official CPI.
Savings goals
Today’s target may be too low in future prices. Use inflation scenarios in the savings-goal tool. Not investment advice.
Practical tips
- Match start and end dates.
- Separate price rise from purchasing-power loss.
- Compound multi-year factors.
- Do not treat one item as CPI.
- Mark future rates as scenarios only.
FAQ
Does 50% inflation halve purchasing power?
No. Purchasable quantity falls by about one-third when prices rise 50%. Halving requires prices to double.
Is one product “inflation”?
It is that product’s price change. Official CPI uses a weighted basket.
How to read real pay?
Interpret nominal raises beside the same-period price change. Raises below inflation can cut real pay.
Add yearly rates?
No. Multiply growth factors; 20% then 20% is about 44% compounded.
Is this a forecast?
No. It runs the assumptions you enter.