Some data on this topic.
1. Via Egor Kholmogorov’s eponymous article for Komsomolskaya Pravda, source given as “Sovetskaya Rossiya 1992”, according to which the RSFSR and Belarus were the only net donors.
2. Orlowski, Lucjan T. – 1995 – Direct transfers between the former Soviet Union central budget and the republics: Past evidence and current implications
Russia, Belarus, and Estonia only net donors, if marginal ones; Uzbekistan, Kazakhstan, Kyrgyzstan, Tajikistan, and Turkmenistan massively subsidized.
Armenia was massively subsidized, but part of that must have been an artifact of the 1988 earthquake.
Georgia had a reputation for being massively subsidized, but it seems the sums were relatively modest compared to Central Asia.
The figures in the article with their modest transfers seem more serious.
OTOH, I have talked with central Russians who traveled to other republics in the USSR, and the general impression was that living standards were higher – at least as proxied by availability of nice consumer goods, since that was the real limiting factor – outside the RSFSR, especially in Georgia, the Baltics, and Black Sea/Caspian coastal areas.
3. “Average deposit in savings accounts in the republics.”
Whatever the precise numbers, it is clear that transfers in the USSR went from the Russian core to peripheries. In economic terms, the USSR was the exact opposite of Russian imperialism.
The exact same thing continues in the RSFSR Russian Federation.
This has a very long history.
The Turkestan region was subsidized by the rest of the Russian Empire since its incorporation until its collapse, with a brief exception during 1908-1912 (left – spending; middle – income; right – balance; figures from Boris Mironov’s History of the Russian Empire).