Q-back

Results 2 issues of Q-back

- [x] I am on the [latest](https://github.com/sdispater/pendulum/releases/latest) Pendulum version. - [x] I have searched the [issues](https://github.com/sdispater/pendulum/issues) of this repo and believe that this is not a duplicate. - **OS version...

The marriage doubles the tax limits/thresholds in case the married couple uses "podatek progresywny". It would be great to be able to simulate calculations for this scenario as well. https://poradnikprzedsiebiorcy.pl/-wspolne-rozliczenie-z-malzonkiem-a-nowy-polski-lad