Cardano staking, rewards question

[COSDpool]

Welcome to the forum @joint1

@joint1

if i will stake 10 000 ADA, i will get “7.96” ADA reward for the epoch №1, and “6.19” ADA for epoch №73. Please, can you explain how it works, why reward for epoch 73 less?

After 72 epochs (1 year) the ADA rewards will have decreased according to a geometric curve:

How does Cardano reach its supply cap via staking?

The emissions are non-linear so you will have greater amounts of ADA released in the first few years but very little 10 -20 years from now. By the end of year 2031 we will have less than 1b in reserves… by year 2050 the total reserves will be 18M. This only takes into consideration the reserve emission schedule (i.e. no transaction fees which don’t really affect reserve emissions). [image]

The current value of ρ (in protocol parameters, rho = 0.003) compounded by 72 epochs in a year will yield a decrease in rewards by about 20% per year… though note there are other accounts like the treasury which affect the available rewards (the thread above is a good outline of these):

1 - ((1 - 0.003) ^ 72) = .19452623720183441825

At least this should explain why the rewards expectations go down in a big step this year, and the same proportion every year, geometrically: your staking rewards are a direct result of deliberate inflation at a fixed percentage per year.

@joint1

It seems that reward for every next epoch should be higher, cause our staking balance increasing after every reward payout?

I don’t think a Staking Calculator would compound your rewards like that, since not everybody has rewards credited back into the address or wallet they’re delegating from. In general it will depend on the staking calculator you are using.