Während wir noch arbeiten, wird er das Geld für den Ruhestand angespart haben.

Questions & Answers about Während wir noch arbeiten, wird er das Geld für den Ruhestand angespart haben.

Why does the second half use wird ... angespart haben instead of just wird ... ansparen?
This is the Futur II (Future Perfect). It emphasizes that by a certain point in the future—in this case, the time when we are still working—his action of saving up the money will already be fully completed. If we used the regular future tense (wird ansparen), it would mean he will just be starting or continuing to save at that future time.
The first part talks about a future scenario, but uses the present tense arbeiten. Why isn't it werden arbeiten?
In German, the present tense is very commonly used to talk about the future as long as the context makes the timeframe clear. Additionally, just like in English ("While we are still working"), temporal subordinate clauses starting with words like während or wenn rarely use the future tense, even when describing a future situation.
Why do angespart and haben stack up at the very end of the sentence?
In the Futur II, the conjugated auxiliary verb (wird) takes the second position in the main clause. Because the entire subordinate clause (Während wir noch arbeiten) acts as position one, wird comes right after the comma. The rest of the complex verb structure—the past participle (angespart) and the infinitive auxiliary (haben)—gets pushed to the very end of the sentence.
Why use ansparen instead of the normal word for saving, sparen?
While sparen means generally to save (money, time, resources), ansparen specifically means to systematically accumulate or save up a target amount of money over time for a specific goal. Since he is building up a fund for his retirement (für den Ruhestand), ansparen is the most precise and natural choice here.

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