Deepz1205 6 Dec 2016 #121Thanks a lot for the info Terri. My salary is around 156000PLN per annum and I see a difference of 7359PLN annually in the net if I opt for joint declaration for married couple. There is a clause mentioned in the site calculla.com/salary_in_poland stating:Joint declaration for married couple - check it when you've decided to have a joint declaration (it's not mandatory).Important: if only one of partners works (the other one has no income), then the results displayed here will be perfectly correct. But if both partners work, then the net salary displayed by this calculator will be not fully accurate (the real net salary will be slightly lower than displayed here). This calculator is not able to correctly compute net salary for two working partners.Based on the above information I wanted to understand if this is also applicable for cases where only one member in the family is earning and the partner has no income.Also from the information you provided the second child will get 500 PLN tax exemption per month, right?Request your help on this.