The 2020/21 and 2024/25 programmes are unchanged at $45b and $25b respectively, the Treasury said.
Over the forecast period, the Government will borrow $105b from the bond market, down from $115b estimated at last year's update.
ANZ had expected the bond issuance to fall by $20b over the forecast period, and Westpac was looking at a $35b decline.
Westpac senior markets strategist Imre Speizer said the reduction was smaller than many had expected.
"The reason for all of this is that the Treasury's economic forecasts, we think, are too pessimistic," Speizer said.
The conservative economic outlook adopted by the Government would mean its operating balance would not improve by as much, which meant it would have less scope to reduce debt than it would have done otherwise, he said.
ANZ markets strategist David Croy said the meagre cut in the programme came as a big surprise.
"We had been expecting a $5b reduction to next year's bond programme, within a $20b overall reduction in cumulative issuance over the next four years," he said.
"But next year's programme has been left unchanged at $30b and the cumulative reduction over the next four years was half that at just $10b," Croy said.
After the Budget's delivery at 2 pm, the New Zealand dollar was unchanged at about US71.68c while bond yields edged up by one or two basis points.
In the Budget, the Treasury said GDP was expected to rise from 2.9 per cent this year, to 4.4 per cent in 2023 and an extra 221,000 extra people are expected to be in employment over the next four years with unemployment expected to drop to 4.2 per cent by 2025.
The Treasury is, however, still expecting the Government to produce a deficit for each of the next six years, and then a minor surplus in 2027.
Budget documents said net core debt would peak at 48 per cent of GDP in the 2023 financial year, down from 52.6 per cent forecast in December.
Ratings agency S&P Global Ratings said the budget confirmed that New Zealand is recovering quicker than most advanced economies.
"This is consistent with our expectations that the economic and fiscal shock will be temporary, though debt levels will remain elevated for some time," S&P said.
"Given the pace of recovery, we believe the Government's credit metrics can withstand further negative shocks to the economy and its fiscal position at the current rating level," the agency said.
S&P increased New Zealand's long-term foreign currency rating to "AA+" from "AA" in February.
"While the Government is targeting additional spending on housing affordability, climate change, and welfare, we believe the general government deficit will narrow over the next few years," S&P said.
