diff --git a/src/cli_user_choices.rs b/src/cli_user_choices.rs
index 9d73c8e..aaccfb1 100644
--- a/src/cli_user_choices.rs
+++ b/src/cli_user_choices.rs
@@ -142,7 +142,7 @@ pub fn choose_inventory_costing_method() -> InventoryCostingMethod {
 
     method
 }
-pub fn inv_costing_from_cmd_arg(arg: String) -> Result<(InventoryCostingMethod), &'static str> {
+pub fn inv_costing_from_cmd_arg(arg: String) -> Result<InventoryCostingMethod, &'static str> {
 
     match arg.trim() { // Without .trim(), there's a hidden \n or something preventing the match
         "1" => Ok(InventoryCostingMethod::LIFObyLotCreationDate),
diff --git a/src/core_functions.rs b/src/core_functions.rs
index 741b30a..acb5c4b 100644
--- a/src/core_functions.rs
+++ b/src/core_functions.rs
@@ -4,7 +4,6 @@
 use std::path::PathBuf;
 use std::error::Error;
 use std::fs::File;
-use std::process;
 use std::collections::{HashMap};
 
 use chrono::NaiveDate;
@@ -45,13 +44,13 @@ pub struct ImportProcessParameters {
 pub fn import_and_process_final(
     input_file_path: PathBuf,
     settings: &ImportProcessParameters,
-) -> (
+) -> Result<(
     HashMap<u16, Account>,
     HashMap<u16, RawAccount>,
     HashMap<u32, ActionRecord>,
     HashMap<u32, Transaction>,
     Option<LikeKindSettings>
-) {
+), Box<Error>> {
 
     let mut transactions_map: HashMap<u32, Transaction> = HashMap::new();
     let mut action_records_map: HashMap<u32, ActionRecord> = HashMap::new();
@@ -67,7 +66,12 @@ pub fn import_and_process_final(
         &mut account_map
     ) {
         Ok(()) => { println!("Successfully imported csv file."); }
-        Err(err) => { println!("\nFailed to import accounts and transactions from CSV."); println!("{}", err); process::exit(1); }
+        Err(err) => {
+            println!("\nFailed to import accounts and transactions from CSV.");
+            println!("{}", err);
+
+            return Err(err);
+        }
     };
 
     pub fn import_from_csv(
@@ -169,5 +173,5 @@ pub fn import_and_process_final(
         println!("  Successfully applied like-kind treatment.");
     };
 
-    (account_map, raw_account_map, action_records_map, transactions_map, likekind_settings)
+    Ok((account_map, raw_account_map, action_records_map, transactions_map, likekind_settings))
 }
diff --git a/src/main.rs b/src/main.rs
index c09034d..2f23bd5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -152,13 +152,17 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
             lk_cutoff_date_string: like_kind_cutoff_date,
         };
 
+        let res = core_functions::import_and_process_final(input_file_path, &settings);
+        if res.is_err() {
+            return Err(res.err().unwrap())
+        }
         let (
             account_map1,
             raw_acct_map1,
             action_records_map1,
             transactions_map1,
             like_kind_settings1
-        ) = core_functions::import_and_process_final(input_file_path, &settings);
+        ) = res.unwrap();
 
         account_map = account_map1;
         raw_acct_map = raw_acct_map1;
@@ -245,14 +249,17 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
             enable_like_kind_treatment: like_kind_election,
             lk_cutoff_date_string: like_kind_cutoff_date_string,
         };
-
+        let res = core_functions::import_and_process_final(input_file_path, &settings);
+        if res.is_err() {
+            return Err(res.err().unwrap())
+        }
         let (
             account_map1,
             raw_acct_map1,
             action_records_map1,
             transactions_map1,
             like_kind_settings1
-        ) = core_functions::import_and_process_final(input_file_path, &settings);
+        ) = res.unwrap();
 
         account_map = account_map1;
         raw_acct_map = raw_acct_map1;