>>121141413But it's not. Taxes in medieval times weren't permanently levied by the government like ours, they were occasionally set by kings to raise money for wars or building projects. Kings raised funds from the revenue of their personal land holdings and from tariffs on trade.
Here the books are clear. Aragorn was a good steward and ruler, and the land prospered and was repopulated. Since much of that land was by right Aragorn's own demesne, he would have levied taxes from that to support his wars against the Orcs. GRRM was just being petty and refusing to make even the smallest inference.