I've been selected for a PhD position in a medical school at Lower Saxony in a DFG Transregio Collaborative Research Project. Even though I'm yet to receive my contract, I am curious to know if my salary will be according to the DFG payscale or the institute payscale (which is significantly lower than the DFG payscale)? My supervisor unofficially told me the scale would be 65% TVöD E-13, but he expects the salary might be between 1350 -1450 € per month for the first year (isn't that lower than 65% TVöD E-13?). On comparing with the DFG pay scale table 2021 (and after reading the first paragraph, of course), I want to know what salary can I actually expect in hand after tax deductions (I'm supposed to have some pension scheme, which I know nothing about)? Would the money be sufficient for 2 people in Hannover if I take my spouse with me? What % of salary will I be able to save, if at all? Thank you.
P.S.: I'm very new to the German system and hence request to guide me. Any obvious issue which I don't know/haven't mentioned in my question can be happily addressed to give me an idea of my upcoming years.