Model: oil & gas revenues scale linearly with the ruble price of oil — OG(P, FX) = ₽8.919trn × (P × FX) ÷ (59 × 92). Non-oil revenues are held at the plan value of ₽31.365trn, expenditures at ₽44.1trn, GDP at the ₽235.7trn implied by the budget's own ratios (revenues 17.1% of GDP). This is a first-order approximation: it ignores the non-linear mineral extraction tax and damper mechanism, assumes constant export volumes, and takes the government's optimistic non-oil revenue plan (which includes the VAT increase to 22%) at face value — in Jan–Apr 2026 actual oil & gas revenues ran 38% below the prior year and the deficit had already reached ₽5.9trn (2.5% of GDP), above the full-year plan.
"Market now" preset approximates Urals as Brent minus a $12/bbl discount; the actual discount varies with sanctions enforcement.
Sources:
Russian Ministry of Finance (2026 budget law figures, monthly execution reports),
OSW budget analysis (Dec 2025),
Interfax (execution data), Bank of Russia (exchange rate), ICE (Brent). Not investment advice; the model illustrates orders of magnitude, not a forecast.