Transaction fees question???

[mokimarket]

Just the other day I sent a bitcoin and I got no transaction fee.

Yesterday when I sent one it said "transaction is over the size limit" and I needed to pay .01.

Why does it do this sometimes and other times it does not?

[Sultan]

Just the other day I sent a bitcoin and I got no transaction fee.

Yesterday when I sent one it said "transaction is over the size limit" and I needed to pay .01.

Why does it do this sometimes and other times it does not?

Using Bitcoin Android I wanted to send 0.1 BTC as a donation sonce last night. It still hasn't been included in a block... :-(

If you haven't owned the coins for long the client believes somethong is dodgy and won't broadcast your transaction. I think.

[Shawshank]

Just the other day I sent a bitcoin and I got no transaction fee.

Yesterday when I sent one it said "transaction is over the size limit" and I needed to pay .01.

Why does it do this sometimes and other times it does not?

Most probably, the balance in your client is made of several amounts from many different Bitcoin addresses. The transaction you are trying to send would become too big to be persisted in the block chain in the next block without a fee. The fee will be processed by and credited to the miner.