Keeping in line with competitors, Tally staking fees are capped at 2%. The Current rate is at 0.4%. All fees on Tally Exchange will never exceed 2%. Fees may fluctuate in order to help regulate a healthy and appealing APR. Being a deflationary token, the APR cannot be regulated by simply minting new tokens into existence, therefore fees are one aspect used to maintain a high ROI and attract more and more users. Whether the fees are as low as 0.4% or hits the higher rate, with high APR returns, rewards will quickly exceed fee values.
Fees also react to the markets. It may rise in order to prevent flash attacks and dissuade bots looking to exploit the pool. One of the prime factors that may raise a fee is to use the higher rate as a mechanism to protect real human stakers. It is necessary at certain times to deter arbitrage opportunists from attempting to take advantage.
See staking tables below.