A rise in the firefighting levy that comes out of insurance premiums has been reduced for coming years.
The levy already went up 12.8 percent in July, and Fire and Emergency was seeking another 5.2 percent rise through to 2029.
However, the government says that has been revised down to 2.2 percent.
In addition, a flat $40 charge on vehicle insurance FENZ sought, up from just $9.53, has been reduced to $25, it said.
Internal Affairs Minister Brooke van Velden said she was assured this was enough to fund essential frontline work.
"It is important that Kiwis are not paying more than necessary to ensure FENZ is resourced to maintain high standards of frontline services," she said in a statement.
She has also told FENZ to find savings of $60 million by 2029 so it can build up its reserves.
FENZ is 97 percent funded by levies, which the insurance industry is unhappy about, wanting the Crown to simply fund it from its main pot.
It earlier argued it needed the 12.8 percent rise because it was "urgent and cannot wait".
"Our operating costs have increased, and we face immediate funding shortfalls," it said in a report in April.
It has a lot of fire stations that need upgrades, seismic or asbestos work, and an ageing fleet of large fire trucks prone to breakdowns.
It earlier forecast its operating costs to rise to $748m next year, plus nearly $90m in capital costs. Its operating costs in 2016 were $423m.
It also has a $75m Crown loan it has to pay back.
The 12.8 percent rise has relieved some of the pressure.
The minister in April asked FENZ's board for evidence it needed the 5.2 percent increase; she earlier refused RNZ's request to see related briefings.