The transfer to world4you is free.
With some domain endings, you may receive the annual invoice immediately after transfer. This is the invoice for the following year. Upon payment, you have settled all invoices for your existing contract as well as the following year.
An example: If you transfer your .com domain to us, but still have 5 months left with your old provider, you will receive an annual invoice immediately. After that, you have already paid the domain invoice for the next (5 + 12 =) 17 months.
The reason for this is simple: To be able to transfer a domain, we as a provider are obliged to report any changes to the registry. As soon as you transfer your domain to us, the registry will immediately charge us for the following year.