[Grammar] have reached/ reach?

[patran]

Dear Teachers

Is it grammatically correct to write the following sentence?

If I were still employed, am I required to make mandatory contribution [after/when] I [have reached/reach] 65?

Cheers

Anthony the learner​

 

[bhaisahab]

Dear Teachers

Is it grammatically correct to write the following sentence?

If I were still employed, am I required to make mandatory contribution [after/when] I [have reached/reach] 65?

Cheers

Anthony the learner
​

If I am still employed when I reach 65, am I required to make mandatory contributions? It's better like that.
There are other ways you could write it.