diff --git a/R/revenue.R b/R/revenue.R
index 583752c..6e9aa5f 100644
--- a/R/revenue.R
+++ b/R/revenue.R
@@ -8,6 +8,16 @@
 #' multiplies by 1000 and records the conversion in `provenance`).
 #'
 #' @inheritParams cog_spending
+#' @param category Character vector of category names (from
+#'   `summary_categories.category`), or `NULL` for all categories broken out
+#'   one row each. The reserved value `"All Categories"` instead returns a
+#'   single summed row per `(year, canonical_govid, subtype)`, covering every
+#'   category inside the requested concept's subtype scope. It cannot be
+#'   combined with other category names, and it is not the same thing as
+#'   `revenue_concept = "total"`: the concept chooses which subtypes are in
+#'   scope, `"All Categories"` chooses whether rows inside that scope are
+#'   broken out or summed. Combine with `subtype = "operations"` for an
+#'   own-source revenue total.
 #' @param revenue_concept Which of Census's two published revenue concepts to
 #'   return. Concepts are defined as sets of the crosswalk's `revenue_subtype`
 #'   values -- never as item-code first letters, which cannot classify
diff --git a/R/spending.R b/R/spending.R
index 6aa82ec..9086e64 100644
--- a/R/spending.R
+++ b/R/spending.R
@@ -71,7 +71,15 @@
 #' @param govid Character vector of `canonical_govid` values.
 #' @param years Integer vector of years.
 #' @param category Character vector of category names (from
-#'   `summary_categories.category`), or `NULL` for all categories.
+#'   `summary_categories.category`), or `NULL` for all categories broken out
+#'   one row each. The reserved value `"All Categories"` instead returns a
+#'   single summed row per `(year, canonical_govid, subtype)`, covering every
+#'   category inside the requested concept's subtype scope. It cannot be
+#'   combined with other category names, and it is not the same thing as
+#'   `expenditure_concept = "total"`: the concept chooses which subtypes are in
+#'   scope, `"All Categories"` chooses whether rows inside that scope are
+#'   broken out or summed. Combine with `subtype = "operations"` for an
+#'   operating-expenditure total.
 #' @param per_capita If `TRUE`, adds `amt_per_capita_nominal` (and
 #'   `amt_per_capita_real` when `adjust_to_year` is set) using the per-year
 #'   Census F-33 population from `gov_population_yearly`. Result also gains
@@ -268,6 +276,17 @@ cog_spending <- function(govid, years, category = NULL,
   .validate_verb_inputs(govid, years, category, per_capita, adjust_to_year,
                         recipe)
 
+  # Recognize the reserved pseudo-category. Detected after type validation so a
+  # non-character `category` still fails with the ordinary type error.
+  all_categories <- !is.null(category) && .ALL_CATEGORIES %in% category
+  if (all_categories && length(category) > 1L) {
+    cli::cli_abort(c(
+      "{.val {(.ALL_CATEGORIES)}} cannot be combined with other categories.",
+      "i" = "It already sums every category in the requested concept's scope.",
+      "*" = "Ask for it alone, or list the specific categories you want."
+    ), class = "uscogdata_all_categories_not_combinable")
+  }
+
   if (!is.null(recipe) && identical(expenditure_concept, "total")) {
     cli::cli_abort(c(
       "`recipe` and `expenditure_concept = \"total\"` are mutually exclusive.",
@@ -341,8 +360,10 @@ cog_spending <- function(govid, years, category = NULL,
     } else {
       NULL
     }
-    sql <- .build_verb_sql(view, subtype_col, govid, years, category, ig_view,
-                           subtype_scope)
+    sql <- .build_verb_sql(view, subtype_col, govid, years,
+                           if (all_categories) NULL else category,
+                           ig_view, subtype_scope,
+                           all_categories = all_categories)
     result <- tibble::as_tibble(DBI::dbGetQuery(con, sql))
   }
 
diff --git a/man/cog_revenue.Rd b/man/cog_revenue.Rd
index 753dede..de677dd 100644
--- a/man/cog_revenue.Rd
+++ b/man/cog_revenue.Rd
@@ -22,7 +22,15 @@ cog_revenue(
 \item{years}{Integer vector of years.}
 
 \item{category}{Character vector of category names (from
-`summary_categories.category`), or `NULL` for all categories.}
+`summary_categories.category`), or `NULL` for all categories broken out
+one row each. The reserved value `"All Categories"` instead returns a
+single summed row per `(year, canonical_govid, subtype)`, covering every
+category inside the requested concept's subtype scope. It cannot be
+combined with other category names, and it is not the same thing as
+`revenue_concept = "total"`: the concept chooses which subtypes are in
+scope, `"All Categories"` chooses whether rows inside that scope are
+broken out or summed. Combine with `subtype = "operations"` for an
+own-source revenue total.}
 
 \item{per_capita}{If `TRUE`, adds `amt_per_capita_nominal` (and
 `amt_per_capita_real` when `adjust_to_year` is set) using the per-year
diff --git a/man/cog_spending.Rd b/man/cog_spending.Rd
index 7a958b9..e0dedd2 100644
--- a/man/cog_spending.Rd
+++ b/man/cog_spending.Rd
@@ -22,7 +22,15 @@ cog_spending(
 \item{years}{Integer vector of years.}
 
 \item{category}{Character vector of category names (from
-`summary_categories.category`), or `NULL` for all categories.}
+`summary_categories.category`), or `NULL` for all categories broken out
+one row each. The reserved value `"All Categories"` instead returns a
+single summed row per `(year, canonical_govid, subtype)`, covering every
+category inside the requested concept's subtype scope. It cannot be
+combined with other category names, and it is not the same thing as
+`expenditure_concept = "total"`: the concept chooses which subtypes are in
+scope, `"All Categories"` chooses whether rows inside that scope are
+broken out or summed. Combine with `subtype = "operations"` for an
+operating-expenditure total.}
 
 \item{per_capita}{If `TRUE`, adds `amt_per_capita_nominal` (and
 `amt_per_capita_real` when `adjust_to_year` is set) using the per-year
diff --git a/tests/testthat/test-all-categories.R b/tests/testthat/test-all-categories.R
index d19dd3c..6b9f6ec 100644
--- a/tests/testthat/test-all-categories.R
+++ b/tests/testthat/test-all-categories.R
@@ -37,3 +37,62 @@ test_that(".build_verb_sql is unchanged when all_categories is FALSE", {
 test_that(".ALL_CATEGORIES is the exact reserved string", {
   expect_identical(uscogdata:::.ALL_CATEGORIES, "All Categories")
 })
+
+test_that('cog_spending(category = "All Categories") sums to the per-category total', {
+  gov <- "552025209777"
+  by_cat <- cog_spending(gov, 2019L)
+  total  <- cog_spending(gov, 2019L, category = "All Categories")
+
+  expect_true(nrow(total) > 0L)
+  expect_setequal(unique(total$category), "All Categories")
+  # one row per subtype present in the by-category result
+  expect_setequal(unique(total$spend_subtype), unique(by_cat$spend_subtype))
+  expect_equal(nrow(total), length(unique(by_cat$spend_subtype)))
+
+  # the dollars agree, per subtype
+  lhs <- tapply(by_cat$amt_nominal, by_cat$spend_subtype, sum)
+  rhs <- tapply(total$amt_nominal,  total$spend_subtype,  sum)
+  expect_equal(as.numeric(rhs[names(lhs)]), as.numeric(lhs), tolerance = 1e-8)
+})
+
+test_that('"All Categories" respects expenditure_concept', {
+  gov <- "552025209777"
+  prim <- cog_spending(gov, 2019L, category = "All Categories",
+                       expenditure_concept = "primary")
+  dir  <- cog_spending(gov, 2019L, category = "All Categories",
+                       expenditure_concept = "direct")
+  # direct = primary plus interest and insurance benefits, so it is never smaller
+  expect_gte(sum(dir$amt_nominal), sum(prim$amt_nominal))
+})
+
+test_that('"All Categories" works on revenue and respects revenue_concept', {
+  gov <- "552025209777"
+  gen <- cog_revenue(gov, 2019L, category = "All Categories",
+                     revenue_concept = "general")
+  tot <- cog_revenue(gov, 2019L, category = "All Categories",
+                     revenue_concept = "total")
+  expect_setequal(unique(gen$category), "All Categories")
+  expect_gte(sum(tot$amt_nominal), sum(gen$amt_nominal))
+})
+
+test_that('"All Categories" cannot be combined with another category', {
+  expect_error(
+    cog_spending("552025209777", 2019L, category = c("All Categories", "Police")),
+    class = "uscogdata_all_categories_not_combinable"
+  )
+})
+
+test_that('"All Categories" is recorded in provenance', {
+  r <- cog_spending("552025209777", 2019L, category = "All Categories")
+  expect_identical(cog_explain(r, format = "list")$category, "All Categories")
+})
+
+test_that('"All Categories" combines with subtype to give operating totals', {
+  gov <- "552025209777"
+  ops_by_cat <- cog_spending(gov, 2019L)
+  ops_by_cat <- ops_by_cat[ops_by_cat$spend_subtype == "operations", ]
+  ops_total  <- cog_spending(gov, 2019L, category = "All Categories")
+  ops_total  <- ops_total[ops_total$spend_subtype == "operations", ]
+  expect_equal(sum(ops_total$amt_nominal), sum(ops_by_cat$amt_nominal),
+               tolerance = 1e-8)
+})