| Party |
| Modified aggregation | Deviations from strict proportionality (power―seats) |
| KPÖ (1945-1959) | seats (rel.) | 0.024675318 |
|
|
| ex ante | 0.035714293 | 0.011038975 |
|
| ex post | 0 | −0.24675318 |
| Greens (since 1986) | seats (rel.) | 0.074190836 |
|
|
| ex ante | 0.058608031 | −0.015582805 |
|
| ex post | 0 | −0.074190836 |
| SPÖ | seats (rel.) | 0.433602479 |
|
|
| ex ante | 0.391257975 | −0.042344504 |
|
| ex post | 0.475124378 | 0.041521899 |
| ÖVP | seats (rel.) | 0.418770529 |
|
|
| ex ante | 0.366382331 | −0.052388198 |
|
| ex post | 0.445273631 | 0.026503102 |
| VdU/FPÖ (since 1949) | seats (rel.) | 0.104511154 |
|
|
| ex ante | 0.212018132 | 0.107506978 |
|
| ex post | 0.084656084 | −0.01985507 |
| Liberales Forum (1994-99) Liberales | seats (rel.) | 0.055737705 |
|
| (1994-2002) | ex ante | 0 | −0.055737705 |
|
| ex post | 0 | −0.055737705 |
| BZÖ (since 2006) | seats (rel.) | 0.089253188 |
|
|
| ex ante | 0.142857 | 0.053603812 |
|
| ex post | 0 | −0.089253188 |