ITV's ad revenue fluctuated during the period because of the Brexit vote, but remained flat for the first half of the year at £838m.
Ad sales were flat in May and jumped 19% in June, according to its interim results released this morning.
Profit before tax for the broadcaster’s first half of 2016 rose 9% to £425m.
The uncertain economic times ahead have led to Adam Crozier, chief executive at ITV, announcing £25m cuts for next year.
The broadcaster expects net advertising revenue to rise by 6% in July, drop by 7% in August and a 10% decline in September.
For the nine months to the end of September, ITV expects NAR to be down 1% but it forecasts outperforming the market this year.
Crozier said: "Against a backdrop of wider economic uncertainty following the EU referendum we have put in place a robust plan to allow us to meet the opportunities and challenges ahead.
"As part of this we are targeting a £25m reduction in overheads for 2017."
ITV’s total revenue increased 11% to £1.5bn over the first half of the year, which was boosted by a 26% rise in non-NAR revenue to £874m compared with £693m during the same period last year.
ITV Studios reported an increase of 31% in total revenue to £651m. Online, pay and interactive revenue rose 26% to £107m.
Crozier said: "On screen we’ve performed strongly with share of viewing on our main channel up 7% while at the same time long form video consumption increased by 50%.
"Our strategy of strengthening and rebalancing the business is clearly working and remains the right one for ITV.
"We have a strong balance sheet and the capacity to continue to invest behind our strategy, while at the same time delivering returns to our shareholders."